121110221 has 4 divisors (see below), whose sum is σ = 122471100. Its totient is φ = 119749344.

The previous prime is 121110191. The next prime is 121110233. The reversal of 121110221 is 122011121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122011121 = 41 ⋅2975881.

It can be written as a sum of positive squares in 2 ways, for example, as 23377225 + 97732996 = 4835^2 + 9886^2 .

It is a cyclic number.

It is not a de Polignac number, because 121110221 - 2²² = 116915917 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 (121110251) 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, 680306 + ... + 680483.

It is an arithmetic number, because the mean of its divisors is an integer number (30617775).

Almost surely, 2^121110221 is an apocalyptic number.

It is an amenable number.

121110221 is a deficient number, since it is larger than the sum of its proper divisors (1360879).

121110221 is an equidigital number, since it uses as much as digits as its factorization.

121110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360878.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 121110221 is about 11005.0089050396. The cubic root of 121110221 is about 494.7588813097.

Adding to 121110221 its reverse (122011121), we get a palindrome (243121342).

The spelling of 121110221 in words is "one hundred twenty-one million, one hundred ten thousand, two hundred twenty-one".