202102110021021 has 16 divisors (see below), whose sum is σ = 307970458396800. Its totient is φ = 115484918125248.

The previous prime is 202102110020971. The next prime is 202102110021029. The reversal of 202102110021021 is 120120011201202.

It is not a de Polignac number, because 202102110021021 - 2⁹ = 202102110020509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102110021029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82171206 + ... + 84594983.

It is an arithmetic number, because the mean of its divisors is an integer number (19248153649800).

Almost surely, 2^{202102110021021} is an apocalyptic number.

202102110021021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

202102110021021 is a deficient number, since it is larger than the sum of its proper divisors (105868348375779).

202102110021021 is a wasteful number, since it uses less digits than its factorization.

202102110021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166823908.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 202102110021021 its reverse (120120011201202), we get a palindrome (322222121222223).

The spelling of 202102110021021 in words is "two hundred two trillion, one hundred two billion, one hundred ten million, twenty-one thousand, twenty-one".