121125221 has 8 divisors (see below), whose sum is σ = 146571840. Its totient is φ = 97714368.

The previous prime is 121125217. The next prime is 121125233. The reversal of 121125221 is 122521121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121125221 - 2² = 121125217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121125221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121125211) 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, 508811 + ... + 509048.

It is an arithmetic number, because the mean of its divisors is an integer number (18321480).

Almost surely, 2^121125221 is an apocalyptic number.

It is an amenable number.

121125221 is a deficient number, since it is larger than the sum of its proper divisors (25446619).

121125221 is a wasteful number, since it uses less digits than its factorization.

121125221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017883.

The product of its digits is 80, while the sum is 17.

The square root of 121125221 is about 11005.6903917928. The cubic root of 121125221 is about 494.7793064420.

Adding to 121125221 its reverse (122521121), we get a palindrome (243646342).

The spelling of 121125221 in words is "one hundred twenty-one million, one hundred twenty-five thousand, two hundred twenty-one".