21364639306 has 16 divisors (see below), whose sum is σ = 32659200000. Its totient is φ = 10478333008.

The previous prime is 21364639267. The next prime is 21364639321. The reversal of 21364639306 is 60393646312.

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, 487695 + ... + 529693.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200000).

Almost surely, 2^21364639306 is an apocalyptic number.

21364639306 is a deficient number, since it is larger than the sum of its proper divisors (11294560694).

21364639306 is a wasteful number, since it uses less digits than its factorization.

21364639306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46853.

The product of its (nonzero) digits is 419904, while the sum is 43.

The spelling of 21364639306 in words is "twenty-one billion, three hundred sixty-four million, six hundred thirty-nine thousand, three hundred six".