21315051312 has 40 divisors (see below), whose sum is σ = 55609082160. Its totient is φ = 7034668800.

The previous prime is 21315051311. The next prime is 21315051313.

21315051312 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21315051311) and next prime (21315051313).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21315051311) 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, 2193487 + ... + 2203182.

It is an arithmetic number, because the mean of its divisors is an integer number (1390227054).

Almost surely, 2^21315051312 is an apocalyptic number.

It is an amenable number.

21315051312 is an abundant number, since it is smaller than the sum of its proper divisors (34294030848).

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

21315051312 is a wasteful number, since it uses less digits than its factorization.

21315051312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396781 (or 4396775 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

It can be divided in two parts, 213150 and 51312, that added together give a palindrome (264462).

The spelling of 21315051312 in words is "twenty-one billion, three hundred fifteen million, fifty-one thousand, three hundred twelve".