202122221 has 4 divisors (see below), whose sum is σ = 230996832. Its totient is φ = 173247612.

The previous prime is 202122203. The next prime is 202122233. The reversal of 202122221 is 122221202.

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 a cyclic number.

It is not a de Polignac number, because 202122221 - 2¹⁴ = 202105837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202122196 and 202122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14437295 + ... + 14437308.

It is an arithmetic number, because the mean of its divisors is an integer number (57749208).

Almost surely, 2^202122221 is an apocalyptic number.

It is an amenable number.

202122221 is a deficient number, since it is larger than the sum of its proper divisors (28874611).

202122221 is an equidigital number, since it uses as much as digits as its factorization.

202122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28874610.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 202122221 is about 14216.9694731332. The cubic root of 202122221 is about 586.8647448327.

Adding to 202122221 its reverse (122221202), we get a palindrome (324343423).

It can be divided in two parts, 2021 and 22221, that added together give a palindrome (24242).

The spelling of 202122221 in words is "two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".