210021311231 has 2 divisors, whose sum is σ = 210021311232. Its totient is φ = 210021311230.

The previous prime is 210021311179. The next prime is 210021311233. The reversal of 210021311231 is 132113120012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210021311231 - 2³⁰ = 208947569407 is a prime.

It is a super-2 number, since 2×210021311231² (a number of 23 digits) contains 22 as substring.

Together with 210021311233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021311233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010655615 + 105010655616.

It is an arithmetic number, because the mean of its divisors is an integer number (105010655616).

Almost surely, 2^210021311231 is an apocalyptic number.

210021311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021311231 is an equidigital number, since it uses as much as digits as its factorization.

210021311231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 210021311231 its reverse (132113120012), we get a palindrome (342134431243).

The spelling of 210021311231 in words is "two hundred ten billion, twenty-one million, three hundred eleven thousand, two hundred thirty-one".