21364715402615 has 24 divisors (see below), whose sum is σ = 27921959400960. Its totient is φ = 15685823846784.

The previous prime is 21364715402579. The next prime is 21364715402629. The reversal of 21364715402615 is 51620451746312.

It is not a de Polignac number, because 21364715402615 - 2¹⁶ = 21364715337079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21364715402615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72928055 + ... + 73220424.

It is an arithmetic number, because the mean of its divisors is an integer number (1163414975040).

Almost surely, 2^{21364715402615} is an apocalyptic number.

21364715402615 is a deficient number, since it is larger than the sum of its proper divisors (6557243998345).

21364715402615 is a wasteful number, since it uses less digits than its factorization.

21364715402615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146148683 (or 146148670 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 21364715402615 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred fifteen million, four hundred two thousand, six hundred fifteen".