102011200021 has 4 divisors (see below), whose sum is σ = 102947082700. Its totient is φ = 101075317344.

The previous prime is 102011199989. The next prime is 102011200061. The reversal of 102011200021 is 120002110201.

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 71670785796 + 30340414225 = 267714^2 + 174185^2 .

It is a cyclic number.

It is not a de Polignac number, because 102011200021 - 2⁵ = 102011199989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102011199980 and 102011200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102011200061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 467941176 + ... + 467941393.

It is an arithmetic number, because the mean of its divisors is an integer number (25736770675).

Almost surely, 2^102011200021 is an apocalyptic number.

It is an amenable number.

102011200021 is a deficient number, since it is larger than the sum of its proper divisors (935882679).

102011200021 is an equidigital number, since it uses as much as digits as its factorization.

102011200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935882678.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 102011200021 its reverse (120002110201), we get a palindrome (222013310222).

It can be divided in two parts, 10201 and 1200021, that multiplied together give a palindrome (12241414221).

The spelling of 102011200021 in words is "one hundred two billion, eleven million, two hundred thousand, twenty-one".