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100122021221 = 465721499253
BaseRepresentation
bin101110100111110111…
…1001100110101100101
3100120102200020122220012
41131033233030311211
53120022214134341
6113555002220005
710143055065335
oct1351757146545
9316380218805
10100122021221
11395092a8492
12174a27b4605
139597b93651
144bbb3450c5
15290ecde0eb
hex174fbccd65

100122021221 has 4 divisors (see below), whose sum is σ = 100143525132. Its totient is φ = 100100517312.

The previous prime is 100122021199. The next prime is 100122021253. The reversal of 100122021221 is 122120221001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122120221001 = 255083478747.

It can be written as a sum of positive squares in 2 ways, for example, as 23149622500 + 76972398721 = 152150^2 + 277439^2 .

It is a cyclic number.

It is not a de Polignac number, because 100122021221 - 218 = 100121759077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100122021196 and 100122021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100122020221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10744970 + ... + 10754283.

It is an arithmetic number, because the mean of its divisors is an integer number (25035881283).

Almost surely, 2100122021221 is an apocalyptic number.

It is an amenable number.

100122021221 is a deficient number, since it is larger than the sum of its proper divisors (21503911).

100122021221 is an equidigital number, since it uses as much as digits as its factorization.

100122021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21503910.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 100122021221 its reverse (122120221001), we get a palindrome (222242242222).

The spelling of 100122021221 in words is "one hundred billion, one hundred twenty-two million, twenty-one thousand, two hundred twenty-one".

Divisors: 1 4657 21499253 100122021221