21004314239 has 2 divisors, whose sum is σ = 21004314240. Its totient is φ = 21004314238.

The previous prime is 21004314203. The next prime is 21004314251. The reversal of 21004314239 is 93241340012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21004314239 - 2¹² = 21004310143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21004314299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10502157119 + 10502157120.

It is an arithmetic number, because the mean of its divisors is an integer number (10502157120).

Almost surely, 2^21004314239 is an apocalyptic number.

21004314239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21004314239 is an equidigital number, since it uses as much as digits as its factorization.

21004314239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21004314239 in words is "twenty-one billion, four million, three hundred fourteen thousand, two hundred thirty-nine".