21122319903161 has 2 divisors, whose sum is σ = 21122319903162. Its totient is φ = 21122319903160.

The previous prime is 21122319903121. The next prime is 21122319903211. The reversal of 21122319903161 is 16130991322112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13754455690000 + 7367864213161 = 3708700^2 + 2714381^2 .

It is a cyclic number.

It is not a de Polignac number, because 21122319903161 - 2³⁴ = 21105140033977 is a prime.

It is not a weakly prime, because it can be changed into another prime (21122319903121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561159951580 + 10561159951581.

It is an arithmetic number, because the mean of its divisors is an integer number (10561159951581).

Almost surely, 2^{21122319903161} is an apocalyptic number.

It is an amenable number.

21122319903161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122319903161 is an equidigital number, since it uses as much as digits as its factorization.

21122319903161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 41.

The spelling of 21122319903161 in words is "twenty-one trillion, one hundred twenty-two billion, three hundred nineteen million, nine hundred three thousand, one hundred sixty-one".