22118015891 has 2 divisors, whose sum is σ = 22118015892. Its totient is φ = 22118015890.

The previous prime is 22118015867. The next prime is 22118015981. The reversal of 22118015891 is 19851081122.

Together with next prime (22118015981) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22118015891 is a prime.

It is not a weakly prime, because it can be changed into another prime (22118015831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11059007945 + 11059007946.

It is an arithmetic number, because the mean of its divisors is an integer number (11059007946).

Almost surely, 2^22118015891 is an apocalyptic number.

22118015891 is a deficient number, since it is larger than the sum of its proper divisors (1).

22118015891 is an equidigital number, since it uses as much as digits as its factorization.

22118015891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 38.

The spelling of 22118015891 in words is "twenty-two billion, one hundred eighteen million, fifteen thousand, eight hundred ninety-one".