100102020021221 has 4 divisors (see below), whose sum is σ = 101093129130444. Its totient is φ = 99110910912000.

The previous prime is 100102020021217. The next prime is 100102020021257. The reversal of 100102020021221 is 122120020201001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 97254330021121 + 2847690000100 = 9861761^2 + 1687510^2 .

It is a cyclic number.

It is not a de Polignac number, because 100102020021221 - 2² = 100102020021217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100102020021196 and 100102020021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100102020026221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495554554460 + ... + 495554554661.

It is an arithmetic number, because the mean of its divisors is an integer number (25273282282611).

Almost surely, 2^{100102020021221} is an apocalyptic number.

It is an amenable number.

100102020021221 is a deficient number, since it is larger than the sum of its proper divisors (991109109223).

100102020021221 is an equidigital number, since it uses as much as digits as its factorization.

100102020021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991109109222.

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

Adding to 100102020021221 its reverse (122120020201001), we get a palindrome (222222040222222).

The spelling of 100102020021221 in words is "one hundred trillion, one hundred two billion, twenty million, twenty-one thousand, two hundred twenty-one".