21338222713 has 2 divisors, whose sum is σ = 21338222714. Its totient is φ = 21338222712.

The previous prime is 21338222651. The next prime is 21338222723. The reversal of 21338222713 is 31722283312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17627341824 + 3710880889 = 132768^2 + 60917^2 .

It is a cyclic number.

It is not a de Polignac number, because 21338222713 - 2²¹ = 21336125561 is a prime.

It is not a weakly prime, because it can be changed into another prime (21338222723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10669111356 + 10669111357.

It is an arithmetic number, because the mean of its divisors is an integer number (10669111357).

Almost surely, 2^21338222713 is an apocalyptic number.

It is an amenable number.

21338222713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21338222713 is an equidigital number, since it uses as much as digits as its factorization.

21338222713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The spelling of 21338222713 in words is "twenty-one billion, three hundred thirty-eight million, two hundred twenty-two thousand, seven hundred thirteen".