21915626339 has 2 divisors, whose sum is σ = 21915626340. Its totient is φ = 21915626338.

The previous prime is 21915626321. The next prime is 21915626371. The reversal of 21915626339 is 93362651912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21915626339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21915626293 and 21915626302.

It is not a weakly prime, because it can be changed into another prime (21915626939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10957813169 + 10957813170.

It is an arithmetic number, because the mean of its divisors is an integer number (10957813170).

Almost surely, 2^21915626339 is an apocalyptic number.

21915626339 is a deficient number, since it is larger than the sum of its proper divisors (1).

21915626339 is an equidigital number, since it uses as much as digits as its factorization.

21915626339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 47.

The spelling of 21915626339 in words is "twenty-one billion, nine hundred fifteen million, six hundred twenty-six thousand, three hundred thirty-nine".