21582952940 has 24 divisors (see below), whose sum is σ = 45327055200. Its totient is φ = 8632637568.

The previous prime is 21582952901. The next prime is 21582953101. The reversal of 21582952940 is 4925928512.

It is a super-2 number, since 2×21582952940² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

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, 484736 + ... + 527384.

It is an arithmetic number, because the mean of its divisors is an integer number (1888627300).

Almost surely, 2^21582952940 is an apocalyptic number.

21582952940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21582952940 is an abundant number, since it is smaller than the sum of its proper divisors (23744102260).

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

21582952940 is a wasteful number, since it uses less digits than its factorization.

21582952940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67961 (or 67959 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 21582952940 in words is "twenty-one billion, five hundred eighty-two million, nine hundred fifty-two thousand, nine hundred forty".