21629906715 has 8 divisors (see below), whose sum is σ = 34607850768. Its totient is φ = 11535950240.

The previous prime is 21629906693. The next prime is 21629906723. The reversal of 21629906715 is 51760992612.

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

It is not a de Polignac number, because 21629906715 - 2⁷ = 21629906587 is a prime.

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, 720996876 + ... + 720996905.

It is an arithmetic number, because the mean of its divisors is an integer number (4325981346).

Almost surely, 2^21629906715 is an apocalyptic number.

21629906715 is a deficient number, since it is larger than the sum of its proper divisors (12977944053).

21629906715 is a wasteful number, since it uses less digits than its factorization.

21629906715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441993789.

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 21629906715 in words is "twenty-one billion, six hundred twenty-nine million, nine hundred six thousand, seven hundred fifteen".