21732744879 has 16 divisors (see below), whose sum is σ = 32208121440. Its totient is φ = 14483338560.

The previous prime is 21732744851. The next prime is 21732744907. The reversal of 21732744879 is 97844723712.

21732744879 is a `hidden beast` number, since 2 + 173 + 27 + 448 + 7 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (21732744851) and next prime (21732744907).

It is not a de Polignac number, because 21732744879 - 2⁷ = 21732744751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732744829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65262 + ... + 218459.

It is an arithmetic number, because the mean of its divisors is an integer number (2013007590).

Almost surely, 2^21732744879 is an apocalyptic number.

21732744879 is a deficient number, since it is larger than the sum of its proper divisors (10475376561).

21732744879 is a wasteful number, since it uses less digits than its factorization.

21732744879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286567 (or 286561 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The spelling of 21732744879 in words is "twenty-one billion, seven hundred thirty-two million, seven hundred forty-four thousand, eight hundred seventy-nine".