21210231022831 has 2 divisors, whose sum is σ = 21210231022832. Its totient is φ = 21210231022830.

The previous prime is 21210231022823. The next prime is 21210231022837. The reversal of 21210231022831 is 13822013201212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210231022831 - 2³ = 21210231022823 is a prime.

It is a super-2 number, since 2×21210231022831² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21210231022831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210231022837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605115511415 + 10605115511416.

It is an arithmetic number, because the mean of its divisors is an integer number (10605115511416).

Almost surely, 2^{21210231022831} is an apocalyptic number.

21210231022831 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210231022831 is an equidigital number, since it uses as much as digits as its factorization.

21210231022831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The spelling of 21210231022831 in words is "twenty-one trillion, two hundred ten billion, two hundred thirty-one million, twenty-two thousand, eight hundred thirty-one".