21600161969 has 2 divisors, whose sum is σ = 21600161970. Its totient is φ = 21600161968.

The previous prime is 21600161941. The next prime is 21600161977. The reversal of 21600161969 is 96916100612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20134191025 + 1465970944 = 141895^2 + 38288^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21600161969 is a prime.

It is a super-2 number, since 2×21600161969² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21600161939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800080984 + 10800080985.

It is an arithmetic number, because the mean of its divisors is an integer number (10800080985).

Almost surely, 2^21600161969 is an apocalyptic number.

It is an amenable number.

21600161969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21600161969 is an equidigital number, since it uses as much as digits as its factorization.

21600161969 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 21600161969 in words is "twenty-one billion, six hundred million, one hundred sixty-one thousand, nine hundred sixty-nine".