21241469 has 2 divisors, whose sum is σ = 21241470. Its totient is φ = 21241468.

The previous prime is 21241457. The next prime is 21241471. The reversal of 21241469 is 96414212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20593444 + 648025 = 4538^2 + 805^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241469 - 2⁴ = 21241453 is a prime.

It is a super-2 number, since 2×21241469² = 902400010555922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 21241471, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21244469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620734 + 10620735.

It is an arithmetic number, because the mean of its divisors is an integer number (10620735).

Almost surely, 2^21241469 is an apocalyptic number.

It is an amenable number.

21241469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241469 is an equidigital number, since it uses as much as digits as its factorization.

21241469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 21241469 is about 4608.8468188908. The cubic root of 21241469 is about 276.9458421317.

The spelling of 21241469 in words is "twenty-one million, two hundred forty-one thousand, four hundred sixty-nine".