121042221 has 4 divisors (see below), whose sum is σ = 161389632. Its totient is φ = 80694812.

The previous prime is 121042189. The next prime is 121042231. The reversal of 121042221 is 122240121.

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 121042221 - 2⁵ = 121042189 is a prime.

It is a super-2 number, since 2×121042221² = 29302438529225682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121042221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121042231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20173701 + ... + 20173706.

It is an arithmetic number, because the mean of its divisors is an integer number (40347408).

Almost surely, 2^121042221 is an apocalyptic number.

It is an amenable number.

121042221 is a deficient number, since it is larger than the sum of its proper divisors (40347411).

121042221 is an equidigital number, since it uses as much as digits as its factorization.

121042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40347410.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 121042221 is about 11001.9189689799. The cubic root of 121042221 is about 494.6662662184. Note that the first 3 decimals are identical.

Adding to 121042221 its reverse (122240121), we get a palindrome (243282342).

The spelling of 121042221 in words is "one hundred twenty-one million, forty-two thousand, two hundred twenty-one".