21122112096817 has 2 divisors, whose sum is σ = 21122112096818. Its totient is φ = 21122112096816.

The previous prime is 21122112096793. The next prime is 21122112096853. The reversal of 21122112096817 is 71869021122112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19562300939041 + 1559811157776 = 4422929^2 + 1248924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122112096817 is a prime.

It is a super-2 number, since 2×21122112096817² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122112096017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561056048408 + 10561056048409.

It is an arithmetic number, because the mean of its divisors is an integer number (10561056048409).

Almost surely, 2^{21122112096817} is an apocalyptic number.

It is an amenable number.

21122112096817 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122112096817 is an equidigital number, since it uses as much as digits as its factorization.

21122112096817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 43.

The spelling of 21122112096817 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred twelve million, ninety-six thousand, eight hundred seventeen".