202201221 has 4 divisors (see below), whose sum is σ = 269601632. Its totient is φ = 134800812.

The previous prime is 202201199. The next prime is 202201261. The reversal of 202201221 is 122102202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 202201221 - 2⁶ = 202201157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202201197 and 202201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202201261) 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 in 3 ways as a sum of consecutive naturals, for example, 33700201 + ... + 33700206.

It is an arithmetic number, because the mean of its divisors is an integer number (67400408).

Almost surely, 2^202201221 is an apocalyptic number.

It is an amenable number.

202201221 is a deficient number, since it is larger than the sum of its proper divisors (67400411).

202201221 is an equidigital number, since it uses as much as digits as its factorization.

202201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67400410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 202201221 is about 14219.7475715992. The cubic root of 202201221 is about 586.9411940815.

Adding to 202201221 its reverse (122102202), we get a palindrome (324303423).

The spelling of 202201221 in words is "two hundred two million, two hundred one thousand, two hundred twenty-one".