21423359 has 2 divisors, whose sum is σ = 21423360. Its totient is φ = 21423358.

The previous prime is 21423343. The next prime is 21423371. The reversal of 21423359 is 95332412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21423359 - 2⁴ = 21423343 is a 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 (21423319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711679 + 10711680.

It is an arithmetic number, because the mean of its divisors is an integer number (10711680).

Almost surely, 2^21423359 is an apocalyptic number.

21423359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423359 is an equidigital number, since it uses as much as digits as its factorization.

21423359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 21423359 is about 4628.5374579882. The cubic root of 21423359 is about 277.7340891943.

The spelling of 21423359 in words is "twenty-one million, four hundred twenty-three thousand, three hundred fifty-nine".