221201121 has 8 divisors (see below), whose sum is σ = 296032320. Its totient is φ = 146918672.

The previous prime is 221201117. The next prime is 221201131. The reversal of 221201121 is 121102122.

221201121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221201121 - 2² = 221201117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221201097 and 221201106.

It is not an unprimeable number, because it can be changed into a prime (221201131) 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, 136245 + ... + 137858.

It is an arithmetic number, because the mean of its divisors is an integer number (37004040).

Almost surely, 2^221201121 is an apocalyptic number.

It is an amenable number.

221201121 is a deficient number, since it is larger than the sum of its proper divisors (74831199).

221201121 is a wasteful number, since it uses less digits than its factorization.

221201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274375.

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

The square root of 221201121 is about 14872.8316402762. The cubic root of 221201121 is about 604.7777076473. Note that the first 4 decimals are identical.

Adding to 221201121 its reverse (121102122), we get a palindrome (342303243).

The spelling of 221201121 in words is "two hundred twenty-one million, two hundred one thousand, one hundred twenty-one".