20896221317 has 2 divisors, whose sum is σ = 20896221318. Its totient is φ = 20896221316.

The previous prime is 20896221271. The next prime is 20896221323. The reversal of 20896221317 is 71312269802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12984830401 + 7911390916 = 113951^2 + 88946^2 .

It is a cyclic number.

It is not a de Polignac number, because 20896221317 - 2¹⁴ = 20896204933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20896221617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10448110658 + 10448110659.

It is an arithmetic number, because the mean of its divisors is an integer number (10448110659).

Almost surely, 2^20896221317 is an apocalyptic number.

It is an amenable number.

20896221317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20896221317 is an equidigital number, since it uses as much as digits as its factorization.

20896221317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 20896221317 in words is "twenty billion, eight hundred ninety-six million, two hundred twenty-one thousand, three hundred seventeen".