21452659 has 2 divisors, whose sum is σ = 21452660. Its totient is φ = 21452658.

The previous prime is 21452611. The next prime is 21452671. The reversal of 21452659 is 95625412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21452659 - 2²¹ = 19355507 is a prime.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (21452609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726329 + 10726330.

It is an arithmetic number, because the mean of its divisors is an integer number (10726330).

Almost surely, 2^21452659 is an apocalyptic number.

21452659 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452659 is an equidigital number, since it uses as much as digits as its factorization.

21452659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 34.

The square root of 21452659 is about 4631.7015231986. The cubic root of 21452659 is about 277.8606473402.

The spelling of 21452659 in words is "twenty-one million, four hundred fifty-two thousand, six hundred fifty-nine".