21952378500 has 96 divisors (see below), whose sum is σ = 68842720128. Its totient is φ = 5403657600.

The previous prime is 21952378489. The next prime is 21952378523. The reversal of 21952378500 is 587325912.

It is a happy 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 31 ways as a sum of consecutive naturals, for example, 543382 + ... + 582381.

It is an arithmetic number, because the mean of its divisors is an integer number (717111668).

Almost surely, 2^21952378500 is an apocalyptic number.

21952378500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21952378500 is an abundant number, since it is smaller than the sum of its proper divisors (46890341628).

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

21952378500 is a wasteful number, since it uses less digits than its factorization.

21952378500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125798 (or 1125786 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The spelling of 21952378500 in words is "twenty-one billion, nine hundred fifty-two million, three hundred seventy-eight thousand, five hundred".