21152039 has 2 divisors, whose sum is σ = 21152040. Its totient is φ = 21152038.

The previous prime is 21152017. The next prime is 21152051. The reversal of 21152039 is 93025112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21152039 - 2⁸ = 21151783 is a prime.

It is a Sophie Germain 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 (21152009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576019 + 10576020.

It is an arithmetic number, because the mean of its divisors is an integer number (10576020).

Almost surely, 2^21152039 is an apocalyptic number.

21152039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152039 is an equidigital number, since it uses as much as digits as its factorization.

21152039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 21152039 is about 4599.1345925076. The cubic root of 21152039 is about 276.5566332334.

The spelling of 21152039 in words is "twenty-one million, one hundred fifty-two thousand, thirty-nine".