201221201 has 4 divisors (see below), whose sum is σ = 201249792. Its totient is φ = 201192612.

The previous prime is 201221183. The next prime is 201221203. The reversal of 201221201 is 102122102.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 102122102 = 2 ⋅51061051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4496 + ... + 20558.

It is an arithmetic number, because the mean of its divisors is an integer number (50312448).

Almost surely, 2^201221201 is an apocalyptic number.

It is an amenable number.

201221201 is a deficient number, since it is larger than the sum of its proper divisors (28591).

201221201 is a wasteful number, since it uses less digits than its factorization.

201221201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28590.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201221201 is about 14185.2458914183. The cubic root of 201221201 is about 585.9914043554.

Adding to 201221201 its reverse (102122102), we get a palindrome (303343303).

Subtracting from 201221201 its reverse (102122102), we obtain a palindrome (99099099).

It can be divided in two parts, 20 and 1221201, that added together give a palindrome (1221221).

The spelling of 201221201 in words is "two hundred one million, two hundred twenty-one thousand, two hundred one".