21840036564 has 24 divisors (see below), whose sum is σ = 50963290560. Its totient is φ = 7279554304.

The previous prime is 21840036553. The next prime is 21840036601. The reversal of 21840036564 is 46563004812.

It is a congruent number.

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, 181252 + ... + 276644.

It is an arithmetic number, because the mean of its divisors is an integer number (2123470440).

Almost surely, 2^21840036564 is an apocalyptic number.

It is an amenable number.

21840036564 is an abundant number, since it is smaller than the sum of its proper divisors (29123253996).

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

21840036564 is a wasteful number, since it uses less digits than its factorization.

21840036564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114479 (or 114477 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The spelling of 21840036564 in words is "twenty-one billion, eight hundred forty million, thirty-six thousand, five hundred sixty-four".