21131311302 has 24 divisors (see below), whose sum is σ = 46467861336. Its totient is φ = 6938639136.

The previous prime is 21131311297. The next prime is 21131311319. The reversal of 21131311302 is 20311313112.

21131311302 is a `hidden beast` number, since 21 + 1 + 31 + 311 + 302 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8759703 + ... + 8762114.

It is an arithmetic number, because the mean of its divisors is an integer number (1936160889).

Almost surely, 2^21131311302 is an apocalyptic number.

21131311302 is an abundant number, since it is smaller than the sum of its proper divisors (25336550034).

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

21131311302 is a wasteful number, since it uses less digits than its factorization.

21131311302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17521892 (or 17521889 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21131311302 its reverse (20311313112), we get a palindrome (41442624414).

The spelling of 21131311302 in words is "twenty-one billion, one hundred thirty-one million, three hundred eleven thousand, three hundred two".