21112339 has 2 divisors, whose sum is σ = 21112340. Its totient is φ = 21112338.

The previous prime is 21112291. The next prime is 21112349. The reversal of 21112339 is 93321112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112339 - 2²¹ = 19015187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556169 + 10556170.

It is an arithmetic number, because the mean of its divisors is an integer number (10556170).

Almost surely, 2^21112339 is an apocalyptic number.

21112339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112339 is an equidigital number, since it uses as much as digits as its factorization.

21112339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 22.

The square root of 21112339 is about 4594.8165360545. The cubic root of 21112339 is about 276.3835029663.

The spelling of 21112339 in words is "twenty-one million, one hundred twelve thousand, three hundred thirty-nine".