21023131231302 has 16 divisors (see below), whose sum is σ = 42050927639280. Its totient is φ = 7006932880992.

The previous prime is 21023131231231. The next prime is 21023131231309. The reversal of 21023131231302 is 20313213132012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023131231309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194323777 + ... + 194431932.

It is an arithmetic number, because the mean of its divisors is an integer number (2628182977455).

Almost surely, 2^{21023131231302} is an apocalyptic number.

21023131231302 is an abundant number, since it is smaller than the sum of its proper divisors (21027796407978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21023131231302 is a wasteful number, since it uses less digits than its factorization.

21023131231302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388764727.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21023131231302 its reverse (20313213132012), we get a palindrome (41336344363314).

The spelling of 21023131231302 in words is "twenty-one trillion, twenty-three billion, one hundred thirty-one million, two hundred thirty-one thousand, three hundred two".