21003201239 has 2 divisors, whose sum is σ = 21003201240. Its totient is φ = 21003201238.

The previous prime is 21003201221. The next prime is 21003201269. The reversal of 21003201239 is 93210230012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003201239 - 2²⁸ = 20734765783 is a prime.

It is a super-2 number, since 2×21003201239² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21003201269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501600619 + 10501600620.

It is an arithmetic number, because the mean of its divisors is an integer number (10501600620).

Almost surely, 2^21003201239 is an apocalyptic number.

21003201239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003201239 is an equidigital number, since it uses as much as digits as its factorization.

21003201239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 21003201239 in words is "twenty-one billion, three million, two hundred one thousand, two hundred thirty-nine".