21254269 has 2 divisors, whose sum is σ = 21254270. Its totient is φ = 21254268.

The previous prime is 21254263. The next prime is 21254273. The reversal of 21254269 is 96245212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 9998244 = 3355^2 + 3162^2 .

It is a cyclic number.

It is not a de Polignac number, because 21254269 - 2¹⁹ = 20729981 is a prime.

It is a super-2 number, since 2×21254269² = 903487901448722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21254269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21254263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627134 + 10627135.

It is an arithmetic number, because the mean of its divisors is an integer number (10627135).

Almost surely, 2^21254269 is an apocalyptic number.

It is an amenable number.

21254269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254269 is an equidigital number, since it uses as much as digits as its factorization.

21254269 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 21254269 is about 4610.2352434556. The cubic root of 21254269 is about 277.0014596751.

The spelling of 21254269 in words is "twenty-one million, two hundred fifty-four thousand, two hundred sixty-nine".