21321320760 has 96 divisors (see below), whose sum is σ = 69942029040. Its totient is φ = 5632538112.

The previous prime is 21321320719. The next prime is 21321320777. The reversal of 21321320760 is 6702312312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238237 + ... + 315276.

Almost surely, 2^21321320760 is an apocalyptic number.

21321320760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321320760 is an abundant number, since it is smaller than the sum of its proper divisors (48620708280).

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

21321320760 is a wasteful number, since it uses less digits than its factorization.

21321320760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553637 (or 553630 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The spelling of 21321320760 in words is "twenty-one billion, three hundred twenty-one million, three hundred twenty thousand, seven hundred sixty".