21934169 has 2 divisors, whose sum is σ = 21934170. Its totient is φ = 21934168.

The previous prime is 21934127. The next prime is 21934183. The reversal of 21934169 is 96143912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13053769 + 8880400 = 3613^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 21934169 - 2¹⁶ = 21868633 is a prime.

It is a super-2 number, since 2×21934169² = 962215539441122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21534169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10967084 + 10967085.

It is an arithmetic number, because the mean of its divisors is an integer number (10967085).

Almost surely, 2^21934169 is an apocalyptic number.

It is an amenable number.

21934169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21934169 is an equidigital number, since it uses as much as digits as its factorization.

21934169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 35.

The square root of 21934169 is about 4683.3928940459. The cubic root of 21934169 is about 279.9241673892.

The spelling of 21934169 in words is "twenty-one million, nine hundred thirty-four thousand, one hundred sixty-nine".