21307756670 has 32 divisors (see below), whose sum is σ = 39686137920. Its totient is φ = 8227206400.

The previous prime is 21307756651. The next prime is 21307756693. The reversal of 21307756670 is 7665770312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1871495 + ... + 1882845.

It is an arithmetic number, because the mean of its divisors is an integer number (1240191810).

Almost surely, 2^21307756670 is an apocalyptic number.

21307756670 is a deficient number, since it is larger than the sum of its proper divisors (18378381250).

21307756670 is a wasteful number, since it uses less digits than its factorization.

21307756670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17860.

The product of its (nonzero) digits is 370440, while the sum is 44.

The spelling of 21307756670 in words is "twenty-one billion, three hundred seven million, seven hundred fifty-six thousand, six hundred seventy".