21500000512 has 36 divisors (see below), whose sum is σ = 44395894620. Its totient is φ = 10379307008.

The previous prime is 21500000503. The next prime is 21500000567.

21500000512 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 4470794496 + 17029206016 = 66864^2 + 130496^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440583 + ... + 1455430.

It is an arithmetic number, because the mean of its divisors is an integer number (1233219295).

Almost surely, 2^21500000512 is an apocalyptic number.

It is an amenable number.

21500000512 is an abundant number, since it is smaller than the sum of its proper divisors (22895894108).

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

21500000512 is an equidigital number, since it uses as much as digits as its factorization.

21500000512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896058 (or 2896044 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

It can be divided in two parts, 21500000 and 512, that added together give a palindrome (21500512).

The spelling of 21500000512 in words is "twenty-one billion, five hundred million, five hundred twelve", and thus it is an aban number.