21246736715 has 8 divisors (see below), whose sum is σ = 25527068448. Its totient is φ = 16976733120.

The previous prime is 21246736633. The next prime is 21246736739. The reversal of 21246736715 is 51763764212.

It is a happy number.

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

It is not a de Polignac number, because 21246736715 - 2²⁶ = 21179627851 is a prime.

It is a Duffinian number.

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, 2577506 + ... + 2585735.

It is an arithmetic number, because the mean of its divisors is an integer number (3190883556).

Almost surely, 2^21246736715 is an apocalyptic number.

21246736715 is a deficient number, since it is larger than the sum of its proper divisors (4280331733).

21246736715 is an equidigital number, since it uses as much as digits as its factorization.

21246736715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5164069.

The product of its digits is 423360, while the sum is 44.

The spelling of 21246736715 in words is "twenty-one billion, two hundred forty-six million, seven hundred thirty-six thousand, seven hundred fifteen".