22991827921 has 8 divisors (see below), whose sum is σ = 23088933504. Its totient is φ = 22894903680.

The previous prime is 22991827919. The next prime is 22991827949. The reversal of 22991827921 is 12972819922.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22991827921 - 2¹ = 22991827919 is a prime.

It is a super-2 number, since 2×22991827921² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22991827981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211836 + ... + 301426.

It is an arithmetic number, because the mean of its divisors is an integer number (2886116688).

Almost surely, 2^22991827921 is an apocalyptic number.

It is an amenable number.

22991827921 is a deficient number, since it is larger than the sum of its proper divisors (97105583).

22991827921 is an equidigital number, since it uses as much as digits as its factorization.

22991827921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90671.

The product of its digits is 653184, while the sum is 52.

The spelling of 22991827921 in words is "twenty-two billion, nine hundred ninety-one million, eight hundred twenty-seven thousand, nine hundred twenty-one".