21840574488 has 32 divisors (see below), whose sum is σ = 54606000960. Its totient is φ = 7279582880.

The previous prime is 21840574477. The next prime is 21840574507. The reversal of 21840574488 is 88447504812.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21840574488.

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, 326203 + ... + 387413.

It is an arithmetic number, because the mean of its divisors is an integer number (1706437530).

Almost surely, 2^21840574488 is an apocalyptic number.

It is an amenable number.

21840574488 is an abundant number, since it is smaller than the sum of its proper divisors (32765426472).

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

21840574488 is a wasteful number, since it uses less digits than its factorization.

21840574488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76087 (or 76083 counting only the distinct ones).

The product of its (nonzero) digits is 2293760, while the sum is 51.

The spelling of 21840574488 in words is "twenty-one billion, eight hundred forty million, five hundred seventy-four thousand, four hundred eighty-eight".