21031210023131 has 16 divisors (see below), whose sum is σ = 26755846310400. Its totient is φ = 16387955859240.

The previous prime is 21031210023121. The next prime is 21031210023143. The reversal of 21031210023131 is 13132001213012.

It is a happy number.

It is not a de Polignac number, because 21031210023131 - 2¹⁸ = 21031209760987 is a prime.

It is a super-2 number, since 2×21031210023131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031210023121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2787063551 + ... + 2787071096.

It is an arithmetic number, because the mean of its divisors is an integer number (1672240394400).

Almost surely, 2^{21031210023131} is an apocalyptic number.

21031210023131 is a deficient number, since it is larger than the sum of its proper divisors (5724636287269).

21031210023131 is an equidigital number, since it uses as much as digits as its factorization.

21031210023131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5574134679 (or 5574134665 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21031210023131 its reverse (13132001213012), we get a palindrome (34163211236143).

The spelling of 21031210023131 in words is "twenty-one trillion, thirty-one billion, two hundred ten million, twenty-three thousand, one hundred thirty-one".