21811731244680 has 64 divisors (see below), whose sum is σ = 70468670180160. Its totient is φ = 5369041536768.

The previous prime is 21811731244663. The next prime is 21811731244759. The reversal of 21811731244680 is 8644213711812.

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, 6990937942 + ... + 6990941061.

It is an arithmetic number, because the mean of its divisors is an integer number (1101072971565).

Almost surely, 2^{21811731244680} is an apocalyptic number.

21811731244680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21811731244680 is an abundant number, since it is smaller than the sum of its proper divisors (48656938935480).

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

21811731244680 is a wasteful number, since it uses less digits than its factorization.

21811731244680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13981879030 (or 13981879026 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 48.

The spelling of 21811731244680 in words is "twenty-one trillion, eight hundred eleven billion, seven hundred thirty-one million, two hundred forty-four thousand, six hundred eighty".