21356215710724 has 48 divisors (see below), whose sum is σ = 39829840606080. Its totient is φ = 9991019865600.

The previous prime is 21356215710707. The next prime is 21356215710751. The reversal of 21356215710724 is 42701751265312.

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, 3393109 + ... + 7363804.

It is an arithmetic number, because the mean of its divisors is an integer number (829788345960).

Almost surely, 2^{21356215710724} is an apocalyptic number.

It is an amenable number.

21356215710724 is a deficient number, since it is larger than the sum of its proper divisors (18473624895356).

21356215710724 is a wasteful number, since it uses less digits than its factorization.

21356215710724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10757260 (or 10757258 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 46.

The spelling of 21356215710724 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred fifteen million, seven hundred ten thousand, seven hundred twenty-four".