21915432959 has 8 divisors (see below), whose sum is σ = 25139319840. Its totient is φ = 18714823776.

The previous prime is 21915432923. The next prime is 21915432971. The reversal of 21915432959 is 95923451912.

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

It is a cyclic number.

It is not a de Polignac number, because 21915432959 - 2⁸ = 21915432703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21915432659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5817404 + ... + 5821169.

It is an arithmetic number, because the mean of its divisors is an integer number (3142414980).

Almost surely, 2^21915432959 is an apocalyptic number.

21915432959 is a deficient number, since it is larger than the sum of its proper divisors (3223886881).

21915432959 is a wasteful number, since it uses less digits than its factorization.

21915432959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11638849.

The product of its digits is 874800, while the sum is 50.

The spelling of 21915432959 in words is "twenty-one billion, nine hundred fifteen million, four hundred thirty-two thousand, nine hundred fifty-nine".