21334039 has 2 divisors, whose sum is σ = 21334040. Its totient is φ = 21334038.

The previous prime is 21334007. The next prime is 21334067. The reversal of 21334039 is 93043312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21334039 - 2⁵ = 21334007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21338039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667019 + 10667020.

It is an arithmetic number, because the mean of its divisors is an integer number (10667020).

Almost surely, 2^21334039 is an apocalyptic number.

21334039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334039 is an equidigital number, since it uses as much as digits as its factorization.

21334039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 21334039 is about 4618.8785435428. The cubic root of 21334039 is about 277.3475677187.

The spelling of 21334039 in words is "twenty-one million, three hundred thirty-four thousand, thirty-nine".