202102111021 has 32 divisors (see below), whose sum is σ = 212386093920. Its totient is φ = 192142540800.

The previous prime is 202102110979. The next prime is 202102111027. The reversal of 202102111021 is 120111201202.

It can be written as a sum of positive squares in 16 ways, for example, as 160184052900 + 41918058121 = 400230^2 + 204739^2 .

It is a cyclic number.

It is not a de Polignac number, because 202102111021 - 2⁷ = 202102110893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202102110992 and 202102111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102111027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141428335 + ... + 141429763.

It is an arithmetic number, because the mean of its divisors is an integer number (6637065435).

Almost surely, 2^202102111021 is an apocalyptic number.

It is an amenable number.

202102111021 is a deficient number, since it is larger than the sum of its proper divisors (10283982899).

202102111021 is a wasteful number, since it uses less digits than its factorization.

202102111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 202102111021 its reverse (120111201202), we get a palindrome (322213312223).

The spelling of 202102111021 in words is "two hundred two billion, one hundred two million, one hundred eleven thousand, twenty-one".