21729095715 has 16 divisors (see below), whose sum is σ = 34894849536. Its totient is φ = 11546085600.

The previous prime is 21729095659. The next prime is 21729095737. The reversal of 21729095715 is 51759092712.

It is a happy number.

It is not a de Polignac number, because 21729095715 - 2⁹ = 21729095203 is a prime.

It is a super-2 number, since 2×21729095715² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2668641 + ... + 2676770.

It is an arithmetic number, because the mean of its divisors is an integer number (2180928096).

Almost surely, 2^21729095715 is an apocalyptic number.

21729095715 is a deficient number, since it is larger than the sum of its proper divisors (13165753821).

21729095715 is a wasteful number, since it uses less digits than its factorization.

21729095715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5345690.

The product of its (nonzero) digits is 396900, while the sum is 48.

The spelling of 21729095715 in words is "twenty-one billion, seven hundred twenty-nine million, ninety-five thousand, seven hundred fifteen".