2201121221 has 4 divisors (see below), whose sum is σ = 2370438252. Its totient is φ = 2031804192.

The previous prime is 2201121173. The next prime is 2201121259. The reversal of 2201121221 is 1221211022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221211022 = 2 ⋅610605511.

It can be written as a sum of positive squares in 2 ways, for example, as 869601121 + 1331520100 = 29489^2 + 36490^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201121221 - 2³⁰ = 1127379397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2201121196 and 2201121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201121521) 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, 84658496 + ... + 84658521.

It is an arithmetic number, because the mean of its divisors is an integer number (592609563).

Almost surely, 2^2201121221 is an apocalyptic number.

It is an amenable number.

2201121221 is a deficient number, since it is larger than the sum of its proper divisors (169317031).

2201121221 is a wasteful number, since it uses less digits than its factorization.

2201121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169317030.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2201121221 is about 46916.1083317873. The cubic root of 2201121221 is about 1300.8123563639.

Adding to 2201121221 its reverse (1221211022), we get a palindrome (3422332243).

The spelling of 2201121221 in words is "two billion, two hundred one million, one hundred twenty-one thousand, two hundred twenty-one".