202102110021 has 64 divisors (see below), whose sum is σ = 343474974720. Its totient is φ = 102903229440.

The previous prime is 202102109977. The next prime is 202102110061. The reversal of 202102110021 is 120011201202.

It is not a de Polignac number, because 202102110021 - 2⁷ = 202102109893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202102109979 and 202102110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102110061) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10891011 + ... + 10909551.

It is an arithmetic number, because the mean of its divisors is an integer number (5366796480).

Almost surely, 2^202102110021 is an apocalyptic number.

202102110021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202102110021 is a deficient number, since it is larger than the sum of its proper divisors (141372864699).

202102110021 is a wasteful number, since it uses less digits than its factorization.

202102110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20194.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 202102110021 its reverse (120011201202), we get a palindrome (322113311223).

The spelling of 202102110021 in words is "two hundred two billion, one hundred two million, one hundred ten thousand, twenty-one".