2021120221 has 2 divisors, whose sum is σ = 2021120222. Its totient is φ = 2021120220.

The previous prime is 2021120201. The next prime is 2021120249. The reversal of 2021120221 is 1220211202.

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., 1588022500 + 433097721 = 39850^2 + 20811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021120221 - 2²³ = 2012731613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021120201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560110 + 1010560111.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560111).

Almost surely, 2^2021120221 is an apocalyptic number.

It is an amenable number.

2021120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021120221 is an equidigital number, since it uses as much as digits as its factorization.

2021120221 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.

The square root of 2021120221 is about 44956.8706762381. The cubic root of 2021120221 is about 1264.3404980923.

Adding to 2021120221 its reverse (1220211202), we get a palindrome (3241331423).

The spelling of 2021120221 in words is "two billion, twenty-one million, one hundred twenty thousand, two hundred twenty-one".