201122221 has 8 divisors (see below), whose sum is σ = 208816920. Its totient is φ = 193478208.

The previous prime is 201122183. The next prime is 201122237. The reversal of 201122221 is 122221102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9853321 + 191268900 = 3139^2 + 13830^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201122221 - 2⁷ = 201122093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201122021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4486 + ... + 20551.

It is an arithmetic number, because the mean of its divisors is an integer number (26102115).

Almost surely, 2^201122221 is an apocalyptic number.

It is an amenable number.

201122221 is a deficient number, since it is larger than the sum of its proper divisors (7694699).

201122221 is a wasteful number, since it uses less digits than its factorization.

201122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25343.

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

The square root of 201122221 is about 14181.7566260319. The cubic root of 201122221 is about 585.8953062277.

Adding to 201122221 its reverse (122221102), we get a palindrome (323343323).

The spelling of 201122221 in words is "two hundred one million, one hundred twenty-two thousand, two hundred twenty-one".