201221121 has 4 divisors (see below), whose sum is σ = 268294832. Its totient is φ = 134147412.

The previous prime is 201221113. The next prime is 201221143. The reversal of 201221121 is 121122102.

201221121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 201221121 - 2³ = 201221113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201221097 and 201221106.

It is not an unprimeable number, because it can be changed into a prime (201221101) 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, 33536851 + ... + 33536856.

It is an arithmetic number, because the mean of its divisors is an integer number (67073708).

Almost surely, 2^201221121 is an apocalyptic number.

It is an amenable number.

201221121 is a deficient number, since it is larger than the sum of its proper divisors (67073711).

201221121 is an equidigital number, since it uses as much as digits as its factorization.

201221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67073710.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 201221121 is about 14185.2430715868. The cubic root of 201221121 is about 585.9913266974.

Adding to 201221121 its reverse (121122102), we get a palindrome (322343223).

The spelling of 201221121 in words is "two hundred one million, two hundred twenty-one thousand, one hundred twenty-one".