21163754240 has 72 divisors (see below), whose sum is σ = 53675848800. Its totient is φ = 7967522816.

The previous prime is 21163754203. The next prime is 21163754303. The reversal of 21163754240 is 4245736112.

It is a super-2 number, since 2×21163754240² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21163754240.

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, 464540 + ... + 508059.

It is an arithmetic number, because the mean of its divisors is an integer number (745497900).

Almost surely, 2^21163754240 is an apocalyptic number.

21163754240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21163754240 is an abundant number, since it is smaller than the sum of its proper divisors (32512094560).

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

21163754240 is an equidigital number, since it uses as much as digits as its factorization.

21163754240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972637 (or 972623 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21163754240 in words is "twenty-one billion, one hundred sixty-three million, seven hundred fifty-four thousand, two hundred forty".