22111201019981 has 2 divisors, whose sum is σ = 22111201019982. Its totient is φ = 22111201019980.

The previous prime is 22111201019977. The next prime is 22111201020037. The reversal of 22111201019981 is 18991010211122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16942353299881 + 5168847720100 = 4116109^2 + 2273510^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111201019981 - 2² = 22111201019977 is a prime.

It is a super-2 number, since 2×22111201019981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22111201019951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055600509990 + 11055600509991.

It is an arithmetic number, because the mean of its divisors is an integer number (11055600509991).

Almost surely, 2^{22111201019981} is an apocalyptic number.

It is an amenable number.

22111201019981 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111201019981 is an equidigital number, since it uses as much as digits as its factorization.

22111201019981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 38.

The spelling of 22111201019981 in words is "twenty-two trillion, one hundred eleven billion, two hundred one million, nineteen thousand, nine hundred eighty-one".