21715700515 has 32 divisors (see below), whose sum is σ = 26757216000. Its totient is φ = 16914213888.

The previous prime is 21715700491. The next prime is 21715700537. The reversal of 21715700515 is 51500751712.

It is a cyclic number.

It is not a de Polignac number, because 21715700515 - 2⁵ = 21715700483 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 31 ways as a sum of consecutive naturals, for example, 19580781 + ... + 19581889.

It is an arithmetic number, because the mean of its divisors is an integer number (836163000).

Almost surely, 2^21715700515 is an apocalyptic number.

21715700515 is a deficient number, since it is larger than the sum of its proper divisors (5041515485).

21715700515 is a wasteful number, since it uses less digits than its factorization.

21715700515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839.

The product of its (nonzero) digits is 12250, while the sum is 34.

The spelling of 21715700515 in words is "twenty-one billion, seven hundred fifteen million, seven hundred thousand, five hundred fifteen".