21319625713 has 2 divisors, whose sum is σ = 21319625714. Its totient is φ = 21319625712.

The previous prime is 21319625689. The next prime is 21319625731. The reversal of 21319625713 is 31752691312.

Together with next prime (21319625731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18239042704 + 3080583009 = 135052^2 + 55503^2 .

It is a cyclic number.

It is not a de Polignac number, because 21319625713 - 2²⁹ = 20782754801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21319625213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10659812856 + 10659812857.

It is an arithmetic number, because the mean of its divisors is an integer number (10659812857).

Almost surely, 2^21319625713 is an apocalyptic number.

It is an amenable number.

21319625713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21319625713 is an equidigital number, since it uses as much as digits as its factorization.

21319625713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The spelling of 21319625713 in words is "twenty-one billion, three hundred nineteen million, six hundred twenty-five thousand, seven hundred thirteen".