21131431212302 has 32 divisors (see below), whose sum is σ = 32353065937920. Its totient is φ = 10348886449440.

The previous prime is 21131431212289. The next prime is 21131431212319. The reversal of 21131431212302 is 20321213413112.

It is a super-2 number, since 2×21131431212302² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161927243 + ... + 162057689.

It is an arithmetic number, because the mean of its divisors is an integer number (1011033310560).

Almost surely, 2^{21131431212302} is an apocalyptic number.

21131431212302 is a deficient number, since it is larger than the sum of its proper divisors (11221634725618).

21131431212302 is a wasteful number, since it uses less digits than its factorization.

21131431212302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137376.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21131431212302 its reverse (20321213413112), we get a palindrome (41452644625414).

The spelling of 21131431212302 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred thirty-one million, two hundred twelve thousand, three hundred two".