21452269 has 2 divisors, whose sum is σ = 21452270. Its totient is φ = 21452268.

The previous prime is 21452243. The next prime is 21452309. The reversal of 21452269 is 96225412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19980900 + 1471369 = 4470^2 + 1213^2 .

It is a cyclic number.

It is not a de Polignac number, because 21452269 - 2⁵ = 21452237 is a prime.

It is a super-2 number, since 2×21452269² = 920399690496722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1356754 and since 21452269 and 1356754 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21452269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21452209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726134 + 10726135.

It is an arithmetic number, because the mean of its divisors is an integer number (10726135).

Almost surely, 2^21452269 is an apocalyptic number.

It is an amenable number.

21452269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452269 is an equidigital number, since it uses as much as digits as its factorization.

21452269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 21452269 is about 4631.6594218487. The cubic root of 21452269 is about 277.8589635348.

The spelling of 21452269 in words is "twenty-one million, four hundred fifty-two thousand, two hundred sixty-nine".