21274499 has 2 divisors, whose sum is σ = 21274500. Its totient is φ = 21274498.

The previous prime is 21274483. The next prime is 21274507. The reversal of 21274499 is 99447212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21274499 - 2⁴ = 21274483 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21274439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10637249 + 10637250.

It is an arithmetic number, because the mean of its divisors is an integer number (10637250).

Almost surely, 2^21274499 is an apocalyptic number.

21274499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274499 is an equidigital number, since it uses as much as digits as its factorization.

21274499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 21274499 is about 4612.4287528373. The cubic root of 21274499 is about 277.0893159480.

The spelling of 21274499 in words is "twenty-one million, two hundred seventy-four thousand, four hundred ninety-nine".