112220021981 has 2 divisors, whose sum is σ = 112220021982. Its totient is φ = 112220021980.

The previous prime is 112220021957. The next prime is 112220022001. The reversal of 112220021981 is 189120022211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101718896356 + 10501125625 = 318934^2 + 102475^2 .

It is an emirp because it is prime and its reverse (189120022211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 112220021981 - 2³⁴ = 95040152797 is a prime.

It is a super-2 number, since 2×112220021981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (112220051981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56110010990 + 56110010991.

It is an arithmetic number, because the mean of its divisors is an integer number (56110010991).

Almost surely, 2^112220021981 is an apocalyptic number.

It is an amenable number.

112220021981 is a deficient number, since it is larger than the sum of its proper divisors (1).

112220021981 is an equidigital number, since it uses as much as digits as its factorization.

112220021981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 112220021981 in words is "one hundred twelve billion, two hundred twenty million, twenty-one thousand, nine hundred eighty-one".