21752522860 has 24 divisors (see below), whose sum is σ = 45871439040. Its totient is φ = 8664601344.

The previous prime is 21752522821. The next prime is 21752522863. The reversal of 21752522860 is 6822525712.

It is not an unprimeable number, because it can be changed into a prime (21752522863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2270589 + ... + 2280148.

It is an arithmetic number, because the mean of its divisors is an integer number (1911309960).

Almost surely, 2^21752522860 is an apocalyptic number.

21752522860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21752522860 is an abundant number, since it is smaller than the sum of its proper divisors (24118916180).

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

21752522860 is a wasteful number, since it uses less digits than its factorization.

21752522860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4550985 (or 4550983 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The spelling of 21752522860 in words is "twenty-one billion, seven hundred fifty-two million, five hundred twenty-two thousand, eight hundred sixty".