21748052860 has 24 divisors (see below), whose sum is σ = 46532628576. Its totient is φ = 8535084480.

The previous prime is 21748052819. The next prime is 21748052867. The reversal of 21748052860 is 6825084712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21748052867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10257456 + ... + 10259575.

It is an arithmetic number, because the mean of its divisors is an integer number (1938859524).

Almost surely, 2^21748052860 is an apocalyptic number.

21748052860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21748052860 is an abundant number, since it is smaller than the sum of its proper divisors (24784575716).

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

21748052860 is a wasteful number, since it uses less digits than its factorization.

21748052860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20517093 (or 20517091 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 21748052860 in words is "twenty-one billion, seven hundred forty-eight million, fifty-two thousand, eight hundred sixty".