202101112021 has 2 divisors, whose sum is σ = 202101112022. Its totient is φ = 202101112020.

The previous prime is 202101112007. The next prime is 202101112039. The reversal of 202101112021 is 120211101202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177165228100 + 24935883921 = 420910^2 + 157911^2 .

It is a cyclic number.

It is not a de Polignac number, because 202101112021 - 2³⁷ = 64662158549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202101111992 and 202101112010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202101112001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101050556010 + 101050556011.

It is an arithmetic number, because the mean of its divisors is an integer number (101050556011).

Almost surely, 2^202101112021 is an apocalyptic number.

It is an amenable number.

202101112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202101112021 is an equidigital number, since it uses as much as digits as its factorization.

202101112021 is an evil number, because the sum of its binary digits is even.

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

Adding to 202101112021 its reverse (120211101202), we get a palindrome (322312213223).

The spelling of 202101112021 in words is "two hundred two billion, one hundred one million, one hundred twelve thousand, twenty-one".