202221121 has 2 divisors, whose sum is σ = 202221122. Its totient is φ = 202221120.

The previous prime is 202221109. The next prime is 202221127. The reversal of 202221121 is 121122202.

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., 200930625 + 1290496 = 14175^2 + 1136^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221121 - 2⁹ = 202220609 is a prime.

It is not a weakly prime, because it can be changed into another prime (202221127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110560 + 101110561.

It is an arithmetic number, because the mean of its divisors is an integer number (101110561).

Almost surely, 2^202221121 is an apocalyptic number.

It is an amenable number.

202221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

202221121 is an equidigital number, since it uses as much as digits as its factorization.

202221121 is an odious number, because the sum of its binary digits is odd.

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

The square root of 202221121 is about 14220.4472855111. The cubic root of 202221121 is about 586.9604484107.

Adding to 202221121 its reverse (121122202), we get a palindrome (323343323).

The spelling of 202221121 in words is "two hundred two million, two hundred twenty-one thousand, one hundred twenty-one".