21401331239 has 2 divisors, whose sum is σ = 21401331240. Its totient is φ = 21401331238.

The previous prime is 21401331227. The next prime is 21401331251. The reversal of 21401331239 is 93213310412.

It is a balanced prime because it is at equal distance from previous prime (21401331227) and next prime (21401331251).

It is a cyclic number.

It is not a de Polignac number, because 21401331239 - 2²⁰ = 21400282663 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21401336239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700665619 + 10700665620.

It is an arithmetic number, because the mean of its divisors is an integer number (10700665620).

Almost surely, 2^21401331239 is an apocalyptic number.

21401331239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401331239 is an equidigital number, since it uses as much as digits as its factorization.

21401331239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 21401331239 in words is "twenty-one billion, four hundred one million, three hundred thirty-one thousand, two hundred thirty-nine".