21131431231023 has 16 divisors (see below), whose sum is σ = 31971905410560. Its totient is φ = 13787884206648.

The previous prime is 21131431231013. The next prime is 21131431231067. The reversal of 21131431231023 is 32013213413112.

21131431231023 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 14 + 312 + 310 + 23 = 666.

It is not a de Polignac number, because 21131431231023 - 2³⁴ = 21114251361839 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131431231013) 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, 8326015765 + ... + 8326018302.

It is an arithmetic number, because the mean of its divisors is an integer number (1998244088160).

Almost surely, 2^{21131431231023} is an apocalyptic number.

21131431231023 is a deficient number, since it is larger than the sum of its proper divisors (10840474179537).

21131431231023 is a wasteful number, since it uses less digits than its factorization.

21131431231023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16652034123 (or 16652034117 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 21131431231023 its reverse (32013213413112), we get a palindrome (53144644644135).

The spelling of 21131431231023 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred thirty-one million, two hundred thirty-one thousand, twenty-three".