21310130239 has 2 divisors, whose sum is σ = 21310130240. Its totient is φ = 21310130238.

The previous prime is 21310130183. The next prime is 21310130243. The reversal of 21310130239 is 93203101312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21310130239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21310130249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655065119 + 10655065120.

It is an arithmetic number, because the mean of its divisors is an integer number (10655065120).

Almost surely, 2^21310130239 is an apocalyptic number.

21310130239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310130239 is an equidigital number, since it uses as much as digits as its factorization.

21310130239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 21310130239 in words is "twenty-one billion, three hundred ten million, one hundred thirty thousand, two hundred thirty-nine".