21044269 has 2 divisors, whose sum is σ = 21044270. Its totient is φ = 21044268.

The previous prime is 21044263. The next prime is 21044279. The reversal of 21044269 is 96244012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 2683044 = 4285^2 + 1638^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044269 - 2⁵ = 21044237 is a prime.

It is a super-2 number, since 2×21044269² = 885722515488722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21044263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10522134 + 10522135.

It is an arithmetic number, because the mean of its divisors is an integer number (10522135).

Almost surely, 2^21044269 is an apocalyptic number.

It is an amenable number.

21044269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21044269 is an equidigital number, since it uses as much as digits as its factorization.

21044269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21044269 is about 4587.4032959835. The cubic root of 21044269 is about 276.0861463567.

The spelling of 21044269 in words is "twenty-one million, forty-four thousand, two hundred sixty-nine".