2021301221 has 2 divisors, whose sum is σ = 2021301222. Its totient is φ = 2021301220.

The previous prime is 2021301197. The next prime is 2021301253. The reversal of 2021301221 is 1221031202.

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., 1139805121 + 881496100 = 33761^2 + 29690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021301221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021301196 and 2021301205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021301281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010650610 + 1010650611.

It is an arithmetic number, because the mean of its divisors is an integer number (1010650611).

Almost surely, 2^2021301221 is an apocalyptic number.

It is an amenable number.

2021301221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021301221 is an equidigital number, since it uses as much as digits as its factorization.

2021301221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2021301221 is about 44958.8836716394. The cubic root of 2021301221 is about 1264.3782393404.

Adding to 2021301221 its reverse (1221031202), we get a palindrome (3242332423).

The spelling of 2021301221 in words is "two billion, twenty-one million, three hundred one thousand, two hundred twenty-one".