21252269 has 2 divisors, whose sum is σ = 21252270. Its totient is φ = 21252268.

The previous prime is 21252251. The next prime is 21252281. The reversal of 21252269 is 96225212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21252100 + 169 = 4610^2 + 13^2 .

It is a cyclic number.

It is not a de Polignac number, because 21252269 - 2¹² = 21248173 is a prime.

It is a super-2 number, since 2×21252269² = 903317875296722, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21252239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626134 + 10626135.

It is an arithmetic number, because the mean of its divisors is an integer number (10626135).

Almost surely, 2^21252269 is an apocalyptic number.

It is an amenable number.

21252269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21252269 is an equidigital number, since it uses as much as digits as its factorization.

21252269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 21252269 is about 4610.0183296816. The cubic root of 21252269 is about 276.9927709061.

The spelling of 21252269 in words is "twenty-one million, two hundred fifty-two thousand, two hundred sixty-nine".