21840537052 has 12 divisors (see below), whose sum is σ = 38271435160. Its totient is φ = 10905841296.

The previous prime is 21840536989. The next prime is 21840537137. The reversal of 21840537052 is 25073504812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3603402 + ... + 3609457.

Almost surely, 2^21840537052 is an apocalyptic number.

It is an amenable number.

21840537052 is a deficient number, since it is larger than the sum of its proper divisors (16430898108).

21840537052 is a wasteful number, since it uses less digits than its factorization.

21840537052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7213620 (or 7213618 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 37.

The spelling of 21840537052 in words is "twenty-one billion, eight hundred forty million, five hundred thirty-seven thousand, fifty-two".