21647874612 has 48 divisors (see below), whose sum is σ = 62168258432. Its totient is φ = 5709329280.

The previous prime is 21647874607. The next prime is 21647874629.

21647874612 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9910939 + ... + 9913122.

Almost surely, 2^21647874612 is an apocalyptic number.

It is an amenable number.

21647874612 is an abundant number, since it is smaller than the sum of its proper divisors (40520383820).

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

21647874612 is a wasteful number, since it uses less digits than its factorization.

21647874612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19824088 (or 19824086 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The spelling of 21647874612 in words is "twenty-one billion, six hundred forty-seven million, eight hundred seventy-four thousand, six hundred twelve".