21080753860 has 24 divisors (see below), whose sum is σ = 44309051136. Its totient is φ = 8424783840.

The previous prime is 21080753843. The next prime is 21080753879. The reversal of 21080753860 is 6835708012.

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, 446836 + ... + 491755.

It is an arithmetic number, because the mean of its divisors is an integer number (1846210464).

Almost surely, 2^21080753860 is an apocalyptic number.

21080753860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21080753860 is an abundant number, since it is smaller than the sum of its proper divisors (23228297276).

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

21080753860 is a wasteful number, since it uses less digits than its factorization.

21080753860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939723 (or 939721 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21080753860 in words is "twenty-one billion, eighty million, seven hundred fifty-three thousand, eight hundred sixty".