21230907169 has 2 divisors, whose sum is σ = 21230907170. Its totient is φ = 21230907168.

The previous prime is 21230907167. The next prime is 21230907179. The reversal of 21230907169 is 96170903212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19884384144 + 1346523025 = 141012^2 + 36695^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230907169 - 2¹ = 21230907167 is a prime.

It is a super-2 number, since 2×21230907169² (a number of 21 digits) contains 22 as substring.

Together with 21230907167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21230907167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615453584 + 10615453585.

It is an arithmetic number, because the mean of its divisors is an integer number (10615453585).

Almost surely, 2^21230907169 is an apocalyptic number.

It is an amenable number.

21230907169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230907169 is an equidigital number, since it uses as much as digits as its factorization.

21230907169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The spelling of 21230907169 in words is "twenty-one billion, two hundred thirty million, nine hundred seven thousand, one hundred sixty-nine".