22116021577 has 6 divisors (see below), whose sum is σ = 23948118222. Its totient is φ = 20414788992.

The previous prime is 22116021539. The next prime is 22116021617. The reversal of 22116021577 is 77512061122.

It can be written as a sum of positive squares in 3 ways, for example, as 2757195081 + 19358826496 = 52509^2 + 139136^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22116021577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22116021517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65431848 + ... + 65432185.

It is an arithmetic number, because the mean of its divisors is an integer number (3991353037).

Almost surely, 2^22116021577 is an apocalyptic number.

It is an amenable number.

22116021577 is a deficient number, since it is larger than the sum of its proper divisors (1832096645).

22116021577 is a wasteful number, since it uses less digits than its factorization.

22116021577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130864059 (or 130864046 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 34.

Adding to 22116021577 its reverse (77512061122), we get a palindrome (99628082699).

The spelling of 22116021577 in words is "twenty-two billion, one hundred sixteen million, twenty-one thousand, five hundred seventy-seven".