210021110231 has 2 divisors, whose sum is σ = 210021110232. Its totient is φ = 210021110230.

The previous prime is 210021110227. The next prime is 210021110239. The reversal of 210021110231 is 132011120012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210021110231 - 2² = 210021110227 is a prime.

It is a super-2 number, since 2×210021110231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021110239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010555115 + 105010555116.

It is an arithmetic number, because the mean of its divisors is an integer number (105010555116).

Almost surely, 2^210021110231 is an apocalyptic number.

210021110231 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021110231 is an equidigital number, since it uses as much as digits as its factorization.

210021110231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 210021110231 its reverse (132011120012), we get a palindrome (342032230243).

The spelling of 210021110231 in words is "two hundred ten billion, twenty-one million, one hundred ten thousand, two hundred thirty-one".