21392359 has 2 divisors, whose sum is σ = 21392360. Its totient is φ = 21392358.

The previous prime is 21392353. The next prime is 21392381. The reversal of 21392359 is 95329312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21392359 - 2³ = 21392351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21392351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10696179 + 10696180.

It is an arithmetic number, because the mean of its divisors is an integer number (10696180).

Almost surely, 2^21392359 is an apocalyptic number.

21392359 is a deficient number, since it is larger than the sum of its proper divisors (1).

21392359 is an equidigital number, since it uses as much as digits as its factorization.

21392359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 34.

The square root of 21392359 is about 4625.1874556606. The cubic root of 21392359 is about 277.6000623915.

The spelling of 21392359 in words is "twenty-one million, three hundred ninety-two thousand, three hundred fifty-nine".