21956500516051 has 8 divisors (see below), whose sum is σ = 21960074016000. Its totient is φ = 21952927262280.

The previous prime is 21956500516039. The next prime is 21956500516063. The reversal of 21956500516051 is 15061500565912.

It is an interprime number because it is at equal distance from previous prime (21956500516039) and next prime (21956500516063).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21956500516051 - 2⁵ = 21956500516019 is a prime.

It is a super-2 number, since 2×21956500516051² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21956500515992 and 21956500516010.

It is not an unprimeable number, because it can be changed into a prime (21956500516081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263228850 + ... + 263312248.

It is an arithmetic number, because the mean of its divisors is an integer number (2745009252000).

Almost surely, 2^{21956500516051} is an apocalyptic number.

21956500516051 is a deficient number, since it is larger than the sum of its proper divisors (3573499949).

21956500516051 is an equidigital number, since it uses as much as digits as its factorization.

21956500516051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123089.

The product of its (nonzero) digits is 405000, while the sum is 46.

The spelling of 21956500516051 in words is "twenty-one trillion, nine hundred fifty-six billion, five hundred million, five hundred sixteen thousand, fifty-one".