21275790760 has 32 divisors (see below), whose sum is σ = 54709176960. Its totient is φ = 7294556736.

The previous prime is 21275790749. The next prime is 21275790803. The reversal of 21275790760 is 6709757212.

It is a self number, because there is not a number n which added to its sum of digits gives 21275790760.

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, 37992204 + ... + 37992763.

It is an arithmetic number, because the mean of its divisors is an integer number (1709661780).

Almost surely, 2^21275790760 is an apocalyptic number.

21275790760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21275790760 is an abundant number, since it is smaller than the sum of its proper divisors (33433386200).

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

21275790760 is a wasteful number, since it uses less digits than its factorization.

21275790760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75984985 (or 75984981 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 46.

The spelling of 21275790760 in words is "twenty-one billion, two hundred seventy-five million, seven hundred ninety thousand, seven hundred sixty".