220012111981 has 2 divisors, whose sum is σ = 220012111982. Its totient is φ = 220012111980.

The previous prime is 220012111967. The next prime is 220012112039. The reversal of 220012111981 is 189111210022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208853570025 + 11158541956 = 457005^2 + 105634^2 .

It is a cyclic number.

It is not a de Polignac number, because 220012111981 - 2²⁵ = 219978557549 is a prime.

It is a super-2 number, since 2×220012111981² (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 (220012111901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110006055990 + 110006055991.

It is an arithmetic number, because the mean of its divisors is an integer number (110006055991).

Almost surely, 2^220012111981 is an apocalyptic number.

It is an amenable number.

220012111981 is a deficient number, since it is larger than the sum of its proper divisors (1).

220012111981 is an equidigital number, since it uses as much as digits as its factorization.

220012111981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 220012111981 in words is "two hundred twenty billion, twelve million, one hundred eleven thousand, nine hundred eighty-one".