21873440652 has 48 divisors (see below), whose sum is σ = 59519577600. Its totient is φ = 6249553296.

The previous prime is 21873440651. The next prime is 21873440671. The reversal of 21873440652 is 25604437812.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (21873440651) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2653008 + ... + 2661239.

It is an arithmetic number, because the mean of its divisors is an integer number (1239991200).

Almost surely, 2^21873440652 is an apocalyptic number.

It is an amenable number.

21873440652 is an abundant number, since it is smaller than the sum of its proper divisors (37646136948).

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

21873440652 is a wasteful number, since it uses less digits than its factorization.

21873440652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5314275 (or 5314259 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 42.

The spelling of 21873440652 in words is "twenty-one billion, eight hundred seventy-three million, four hundred forty thousand, six hundred fifty-two".