21676428812 has 24 divisors (see below), whose sum is σ = 38814442800. Its totient is φ = 10588973760.

The previous prime is 21676428803. The next prime is 21676428857. The reversal of 21676428812 is 21882467612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261758 + ... + 334469.

It is an arithmetic number, because the mean of its divisors is an integer number (1617268450).

Almost surely, 2^21676428812 is an apocalyptic number.

It is an amenable number.

21676428812 is a deficient number, since it is larger than the sum of its proper divisors (17138013988).

21676428812 is a wasteful number, since it uses less digits than its factorization.

21676428812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596441 (or 596439 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The spelling of 21676428812 in words is "twenty-one billion, six hundred seventy-six million, four hundred twenty-eight thousand, eight hundred twelve".