21452999 has 2 divisors, whose sum is σ = 21453000. Its totient is φ = 21452998.

The previous prime is 21452993. The next prime is 21453017. The reversal of 21452999 is 99925412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21452999 - 2¹⁶ = 21387463 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21452993) 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, 10726499 + 10726500.

It is an arithmetic number, because the mean of its divisors is an integer number (10726500).

Almost surely, 2^21452999 is an apocalyptic number.

21452999 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452999 is an equidigital number, since it uses as much as digits as its factorization.

21452999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 41.

The square root of 21452999 is about 4631.7382266272. The cubic root of 21452999 is about 277.8621152565.

The spelling of 21452999 in words is "twenty-one million, four hundred fifty-two thousand, nine hundred ninety-nine".