221113321309981 has 2 divisors, whose sum is σ = 221113321309982. Its totient is φ = 221113321309980.

The previous prime is 221113321309967. The next prime is 221113321310053. The reversal of 221113321309981 is 189903123311122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173455906510756 + 47657414799225 = 13170266^2 + 6903435^2 .

It is a cyclic number.

It is not a de Polignac number, because 221113321309981 - 2⁹ = 221113321309469 is a prime.

It is a super-2 number, since 2×221113321309981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221113321309781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110556660654990 + 110556660654991.

It is an arithmetic number, because the mean of its divisors is an integer number (110556660654991).

Almost surely, 2^{221113321309981} is an apocalyptic number.

It is an amenable number.

221113321309981 is a deficient number, since it is larger than the sum of its proper divisors (1).

221113321309981 is an equidigital number, since it uses as much as digits as its factorization.

221113321309981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 221113321309981 in words is "two hundred twenty-one trillion, one hundred thirteen billion, three hundred twenty-one million, three hundred nine thousand, nine hundred eighty-one".