21131312300 has 72 divisors (see below), whose sum is σ = 52895614464. Its totient is φ = 7177285440.

The previous prime is 21131312297. The next prime is 21131312311. The reversal of 21131312300 is 321313112.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66164 + ... + 215963.

It is an arithmetic number, because the mean of its divisors is an integer number (734661312).

Almost surely, 2^21131312300 is an apocalyptic number.

21131312300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131312300 is an abundant number, since it is smaller than the sum of its proper divisors (31764302164).

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

21131312300 is a wasteful number, since it uses less digits than its factorization.

21131312300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282255 (or 282248 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21131312300 its reverse (321313112), we get a palindrome (21452625412).

The spelling of 21131312300 in words is "twenty-one billion, one hundred thirty-one million, three hundred twelve thousand, three hundred".