22118427281 has 8 divisors (see below), whose sum is σ = 22883872680. Its totient is φ = 21353164672.

The previous prime is 22118427277. The next prime is 22118427283. The reversal of 22118427281 is 18272481122.

It can be written as a sum of positive squares in 4 ways, for example, as 993258256 + 21125169025 = 31516^2 + 145345^2 .

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 22118427281 - 2² = 22118427277 is a prime.

It is a super-2 number, since 2×22118427281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22118427283) 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, 228461 + ... + 310533.

It is an arithmetic number, because the mean of its divisors is an integer number (2860484085).

Almost surely, 2^22118427281 is an apocalyptic number.

It is an amenable number.

22118427281 is a deficient number, since it is larger than the sum of its proper divisors (765445399).

22118427281 is an equidigital number, since it uses as much as digits as its factorization.

22118427281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91395.

The product of its digits is 28672, while the sum is 38.

The spelling of 22118427281 in words is "twenty-two billion, one hundred eighteen million, four hundred twenty-seven thousand, two hundred eighty-one".