21300748169 has 2 divisors, whose sum is σ = 21300748170. Its totient is φ = 21300748168.

The previous prime is 21300748159. The next prime is 21300748193. The reversal of 21300748169 is 96184700312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18331806025 + 2968942144 = 135395^2 + 54488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300748169 is a prime.

It is a super-2 number, since 2×21300748169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21300748159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650374084 + 10650374085.

It is an arithmetic number, because the mean of its divisors is an integer number (10650374085).

Almost surely, 2^21300748169 is an apocalyptic number.

It is an amenable number.

21300748169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21300748169 is an equidigital number, since it uses as much as digits as its factorization.

21300748169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21300748169 in words is "twenty-one billion, three hundred million, seven hundred forty-eight thousand, one hundred sixty-nine".