22321810468721 has 2 divisors, whose sum is σ = 22321810468722. Its totient is φ = 22321810468720.

The previous prime is 22321810468717. The next prime is 22321810468849. The reversal of 22321810468721 is 12786401812322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22135980502321 + 185829966400 = 4704889^2 + 431080^2 .

It is a cyclic number.

It is not a de Polignac number, because 22321810468721 - 2² = 22321810468717 is a prime.

It is a super-3 number, since 3×22321810468721³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (22321810464721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11160905234360 + 11160905234361.

It is an arithmetic number, because the mean of its divisors is an integer number (11160905234361).

Almost surely, 2^{22321810468721} is an apocalyptic number.

It is an amenable number.

22321810468721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22321810468721 is an equidigital number, since it uses as much as digits as its factorization.

22321810468721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 22321810468721 in words is "twenty-two trillion, three hundred twenty-one billion, eight hundred ten million, four hundred sixty-eight thousand, seven hundred twenty-one".