21356495218464 has 192 divisors, whose sum is σ = 68662012317696. Its totient is φ = 5678812744704.

The previous prime is 21356495218453. The next prime is 21356495218559. The reversal of 21356495218464 is 46481259465312.

It is a junction number, because it is equal to n+sod(n) for n = 21356495218398 and 21356495218407.

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, 18100572 + ... + 19244315.

It is an arithmetic number, because the mean of its divisors is an integer number (357614647488).

Almost surely, 2^{21356495218464} is an apocalyptic number.

21356495218464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21356495218464 is an abundant number, since it is smaller than the sum of its proper divisors (47305517099232).

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

21356495218464 is a wasteful number, since it uses less digits than its factorization.

21356495218464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37344967 (or 37344959 counting only the distinct ones).

The product of its digits is 49766400, while the sum is 60.

The spelling of 21356495218464 in words is "twenty-one trillion, three hundred fifty-six billion, four hundred ninety-five million, two hundred eighteen thousand, four hundred sixty-four".