21836648724 has 24 divisors (see below), whose sum is σ = 55584197088. Its totient is φ = 6617166240.

The previous prime is 21836648711. The next prime is 21836648737. The reversal of 21836648724 is 42784663812.

It is an interprime number because it is at equal distance from previous prime (21836648711) and next prime (21836648737).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82714447 + ... + 82714710.

It is an arithmetic number, because the mean of its divisors is an integer number (2316008212).

Almost surely, 2^21836648724 is an apocalyptic number.

It is an amenable number.

21836648724 is an abundant number, since it is smaller than the sum of its proper divisors (33747548364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21836648724 is a wasteful number, since it uses less digits than its factorization.

21836648724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165429175 (or 165429173 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 51.

The spelling of 21836648724 in words is "twenty-one billion, eight hundred thirty-six million, six hundred forty-eight thousand, seven hundred twenty-four".