21326576715 has 12 divisors (see below), whose sum is σ = 36966066384. Its totient is φ = 11374174224.

The previous prime is 21326576699. The next prime is 21326576723. The reversal of 21326576715 is 51767562312.

It is a happy number.

21326576715 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 6 + 576 + 71 + 5 = 666.

It is not a de Polignac number, because 21326576715 - 2⁴ = 21326576699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 473923927 = 21326576715 / (2 + 1 + 3 + 2 + 6 + 5 + 7 + 6 + 7 + 1 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 236961919 + ... + 236962008.

It is an arithmetic number, because the mean of its divisors is an integer number (3080505532).

Almost surely, 2^21326576715 is an apocalyptic number.

21326576715 is a deficient number, since it is larger than the sum of its proper divisors (15639489669).

21326576715 is a wasteful number, since it uses less digits than its factorization.

21326576715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473923938 (or 473923935 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The spelling of 21326576715 in words is "twenty-one billion, three hundred twenty-six million, five hundred seventy-six thousand, seven hundred fifteen".