22091117728 has 12 divisors (see below), whose sum is σ = 43491888090. Its totient is φ = 11045558848.

The previous prime is 22091117701. The next prime is 22091117729. The reversal of 22091117728 is 82771119022.

It can be written as a sum of positive squares in only one way, i.e., 21044724624 + 1046393104 = 145068^2 + 32348^2 .

It is not an unprimeable number, because it can be changed into a prime (22091117729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345173683 + ... + 345173746.

Almost surely, 2^22091117728 is an apocalyptic number.

It is an amenable number.

22091117728 is a deficient number, since it is larger than the sum of its proper divisors (21400770362).

22091117728 is an equidigital number, since it uses as much as digits as its factorization.

22091117728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690347439 (or 690347431 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 22091117728 in words is "twenty-two billion, ninety-one million, one hundred seventeen thousand, seven hundred twenty-eight".