21822257317 has 4 divisors (see below), whose sum is σ = 24939722656. Its totient is φ = 18704791980.

The previous prime is 21822257251. The next prime is 21822257333. The reversal of 21822257317 is 71375222812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21822257317 - 2³¹ = 19674773669 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21822257317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21822254317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1558732659 + ... + 1558732672.

It is an arithmetic number, because the mean of its divisors is an integer number (6234930664).

Almost surely, 2^21822257317 is an apocalyptic number.

It is an amenable number.

21822257317 is a deficient number, since it is larger than the sum of its proper divisors (3117465339).

21822257317 is an equidigital number, since it uses as much as digits as its factorization.

21822257317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117465338.

The product of its digits is 94080, while the sum is 40.

The spelling of 21822257317 in words is "twenty-one billion, eight hundred twenty-two million, two hundred fifty-seven thousand, three hundred seventeen".