21674923 has 2 divisors, whose sum is σ = 21674924. Its totient is φ = 21674922.

The previous prime is 21674911. The next prime is 21674927. The reversal of 21674923 is 32947612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21674923 - 2¹³ = 21666731 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (21674927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837461 + 10837462.

It is an arithmetic number, because the mean of its divisors is an integer number (10837462).

Almost surely, 2^21674923 is an apocalyptic number.

21674923 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674923 is an equidigital number, since it uses as much as digits as its factorization.

21674923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 21674923 is about 4655.6334692499. The cubic root of 21674923 is about 278.8169600579.

The spelling of 21674923 in words is "twenty-one million, six hundred seventy-four thousand, nine hundred twenty-three".