22111128961 has 4 divisors (see below), whose sum is σ = 22124474692. Its totient is φ = 22097783232.

The previous prime is 22111128937. The next prime is 22111128971. The reversal of 22111128961 is 16982111122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10334755600 + 11776373361 = 101660^2 + 108519^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111128961 - 2⁵ = 22111128929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22111128971) 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, 6670380 + ... + 6673693.

It is an arithmetic number, because the mean of its divisors is an integer number (5531118673).

Almost surely, 2^22111128961 is an apocalyptic number.

It is an amenable number.

22111128961 is a deficient number, since it is larger than the sum of its proper divisors (13345731).

22111128961 is a wasteful number, since it uses less digits than its factorization.

22111128961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13345730.

The product of its digits is 3456, while the sum is 34.

The spelling of 22111128961 in words is "twenty-two billion, one hundred eleven million, one hundred twenty-eight thousand, nine hundred sixty-one".