21264365318 has 32 divisors (see below), whose sum is σ = 38391997440. Its totient is φ = 8629104960.

The previous prime is 21264365273. The next prime is 21264365341. The reversal of 21264365318 is 81356346212.

It is a super-2 number, since 2×21264365318² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510083 + ... + 550193.

It is an arithmetic number, because the mean of its divisors is an integer number (1199749920).

Almost surely, 2^21264365318 is an apocalyptic number.

21264365318 is a deficient number, since it is larger than the sum of its proper divisors (17127632122).

21264365318 is a wasteful number, since it uses less digits than its factorization.

21264365318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42132.

The product of its digits is 207360, while the sum is 41.

The spelling of 21264365318 in words is "twenty-one billion, two hundred sixty-four million, three hundred sixty-five thousand, three hundred eighteen".