220120002121 has 2 divisors, whose sum is σ = 220120002122. Its totient is φ = 220120002120.

The previous prime is 220120002059. The next prime is 220120002133. The reversal of 220120002121 is 121200021022.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148178033721 + 71941968400 = 384939^2 + 268220^2 .

It is a cyclic number.

It is not a de Polignac number, because 220120002121 - 2⁷ = 220120001993 is a prime.

It is not a weakly prime, because it can be changed into another prime (220120006121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110060001060 + 110060001061.

It is an arithmetic number, because the mean of its divisors is an integer number (110060001061).

Almost surely, 2^220120002121 is an apocalyptic number.

It is an amenable number.

220120002121 is a deficient number, since it is larger than the sum of its proper divisors (1).

220120002121 is an equidigital number, since it uses as much as digits as its factorization.

220120002121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220120002121 its reverse (121200021022), we get a palindrome (341320023143).

The spelling of 220120002121 in words is "two hundred twenty billion, one hundred twenty million, two thousand, one hundred twenty-one".