121112221 has 4 divisors (see below), whose sum is σ = 121134592. Its totient is φ = 121089852.

The previous prime is 121112203. The next prime is 121112263. The reversal of 121112221 is 122211121.

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 a cyclic number.

It is not a de Polignac number, because 121112221 - 2⁷ = 121112093 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 (121112281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2596 + ... + 15778.

It is an arithmetic number, because the mean of its divisors is an integer number (30283648).

Almost surely, 2^121112221 is an apocalyptic number.

It is an amenable number.

121112221 is a deficient number, since it is larger than the sum of its proper divisors (22371).

121112221 is an equidigital number, since it uses as much as digits as its factorization.

121112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22370.

The product of its digits is 16, while the sum is 13.

The square root of 121112221 is about 11005.0997723783. The cubic root of 121112221 is about 494.7616047581.

Adding to 121112221 its reverse (122211121), we get a palindrome (243323342).

The spelling of 121112221 in words is "one hundred twenty-one million, one hundred twelve thousand, two hundred twenty-one".