2020121102221 has 2 divisors, whose sum is σ = 2020121102222. Its totient is φ = 2020121102220.

The previous prime is 2020121102213. The next prime is 2020121102239. The reversal of 2020121102221 is 1222011210202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1400106594121 + 620014508100 = 1183261^2 + 787410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020121102221 - 2³ = 2020121102213 is a prime.

It is a super-2 number, since 2×2020121102221² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2020121102195 and 2020121102204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2020121102281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010060551110 + 1010060551111.

It is an arithmetic number, because the mean of its divisors is an integer number (1010060551111).

Almost surely, 2^{2020121102221} is an apocalyptic number.

It is an amenable number.

2020121102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2020121102221 is an equidigital number, since it uses as much as digits as its factorization.

2020121102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2020121102221 its reverse (1222011210202), we get a palindrome (3242132312423).

The spelling of 2020121102221 in words is "two trillion, twenty billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-one".