21674899 has 2 divisors, whose sum is σ = 21674900. Its totient is φ = 21674898.

The previous prime is 21674857. The next prime is 21674911. The reversal of 21674899 is 99847612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21674899 - 2²³ = 13286291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21674819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837449 + 10837450.

It is an arithmetic number, because the mean of its divisors is an integer number (10837450).

Almost surely, 2^21674899 is an apocalyptic number.

21674899 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674899 is an equidigital number, since it uses as much as digits as its factorization.

21674899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 21674899 is about 4655.6308917267. The cubic root of 21674899 is about 278.8168571493.

The spelling of 21674899 in words is "twenty-one million, six hundred seventy-four thousand, eight hundred ninety-nine".