21315511140 has 96 divisors (see below), whose sum is σ = 74410527744. Its totient is φ = 4429196160.

The previous prime is 21315511117. The next prime is 21315511169. The reversal of 21315511140 is 4111551312.

It is a self number, because there is not a number n which added to its sum of digits gives 21315511140.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2302254 + ... + 2311493.

It is an arithmetic number, because the mean of its divisors is an integer number (775109664).

Almost surely, 2^21315511140 is an apocalyptic number.

21315511140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21315511140 is an abundant number, since it is smaller than the sum of its proper divisors (53095016604).

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

21315511140 is a wasteful number, since it uses less digits than its factorization.

21315511140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4613777 (or 4613775 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The spelling of 21315511140 in words is "twenty-one billion, three hundred fifteen million, five hundred eleven thousand, one hundred forty".