21161003101969 has 2 divisors, whose sum is σ = 21161003101970. Its totient is φ = 21161003101968.

The previous prime is 21161003101943. The next prime is 21161003102051. The reversal of 21161003101969 is 96910130016112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21120577978369 + 40425123600 = 4595713^2 + 201060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21161003101969 is a prime.

It is a super-2 number, since 2×21161003101969² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21161003101939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580501550984 + 10580501550985.

It is an arithmetic number, because the mean of its divisors is an integer number (10580501550985).

Almost surely, 2^{21161003101969} is an apocalyptic number.

It is an amenable number.

21161003101969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21161003101969 is an equidigital number, since it uses as much as digits as its factorization.

21161003101969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 40.

The spelling of 21161003101969 in words is "twenty-one trillion, one hundred sixty-one billion, three million, one hundred one thousand, nine hundred sixty-nine".