21356215411715 has 8 divisors (see below), whose sum is σ = 27134956052640. Its totient is φ = 16079973956992.

The previous prime is 21356215411709. The next prime is 21356215411771. The reversal of 21356215411715 is 51711451265312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21356215411715 - 2³⁰ = 21355141669891 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 125624796455 + ... + 125624796624.

It is an arithmetic number, because the mean of its divisors is an integer number (3391869506580).

Almost surely, 2^{21356215411715} is an apocalyptic number.

21356215411715 is a deficient number, since it is larger than the sum of its proper divisors (5778740640925).

21356215411715 is a wasteful number, since it uses less digits than its factorization.

21356215411715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251249593101.

The product of its digits is 252000, while the sum is 44.

The spelling of 21356215411715 in words is "twenty-one trillion, three hundred fifty-six billion, two hundred fifteen million, four hundred eleven thousand, seven hundred fifteen".