21982598440 has 32 divisors (see below), whose sum is σ = 53957288160. Its totient is φ = 7993672000.

The previous prime is 21982598423. The next prime is 21982598497. The reversal of 21982598440 is 4489528912.

It is a happy 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, 24979786 + ... + 24980665.

It is an arithmetic number, because the mean of its divisors is an integer number (1686165255).

Almost surely, 2^21982598440 is an apocalyptic number.

21982598440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21982598440 is an abundant number, since it is smaller than the sum of its proper divisors (31974689720).

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

21982598440 is a wasteful number, since it uses less digits than its factorization.

21982598440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49960473 (or 49960469 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 21982598440 in words is "twenty-one billion, nine hundred eighty-two million, five hundred ninety-eight thousand, four hundred forty".