21293773169 has 2 divisors, whose sum is σ = 21293773170. Its totient is φ = 21293773168.

The previous prime is 21293773099. The next prime is 21293773187. The reversal of 21293773169 is 96137739212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18764890225 + 2528882944 = 136985^2 + 50288^2 .

It is a cyclic number.

It is not a de Polignac number, because 21293773169 - 2²⁸ = 21025337713 is a prime.

It is a super-2 number, since 2×21293773169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21293773069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10646886584 + 10646886585.

It is an arithmetic number, because the mean of its divisors is an integer number (10646886585).

Almost surely, 2^21293773169 is an apocalyptic number.

It is an amenable number.

21293773169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21293773169 is an equidigital number, since it uses as much as digits as its factorization.

21293773169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 50.

The spelling of 21293773169 in words is "twenty-one billion, two hundred ninety-three million, seven hundred seventy-three thousand, one hundred sixty-nine".