21312112740 has 48 divisors (see below), whose sum is σ = 59804570112. Its totient is φ = 5670786816.

The previous prime is 21312112711. The next prime is 21312112751. The reversal of 21312112740 is 4721121312.

It is a super-2 number, since 2×21312112740² (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 21312112740.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361204 + ... + 416043.

It is an arithmetic number, because the mean of its divisors is an integer number (1245928544).

Almost surely, 2^21312112740 is an apocalyptic number.

21312112740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312112740 is an abundant number, since it is smaller than the sum of its proper divisors (38492457372).

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

21312112740 is a wasteful number, since it uses less digits than its factorization.

21312112740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777716 (or 777714 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The spelling of 21312112740 in words is "twenty-one billion, three hundred twelve million, one hundred twelve thousand, seven hundred forty".