220120002101981 has 2 divisors, whose sum is σ = 220120002101982. Its totient is φ = 220120002101980.

The previous prime is 220120002101933. The next prime is 220120002102017. The reversal of 220120002101981 is 189101200021022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160987500967225 + 59132501134756 = 12688085^2 + 7689766^2 .

It is a cyclic number.

It is not a de Polignac number, because 220120002101981 - 2²⁶ = 220119934993117 is a prime.

It is a super-2 number, since 2×220120002101981² (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 (220120002101921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110060001050990 + 110060001050991.

It is an arithmetic number, because the mean of its divisors is an integer number (110060001050991).

Almost surely, 2^{220120002101981} is an apocalyptic number.

It is an amenable number.

220120002101981 is a deficient number, since it is larger than the sum of its proper divisors (1).

220120002101981 is an equidigital number, since it uses as much as digits as its factorization.

220120002101981 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 220120002101981 in words is "two hundred twenty trillion, one hundred twenty billion, two million, one hundred one thousand, nine hundred eighty-one".