121120221 has 4 divisors (see below), whose sum is σ = 161493632. Its totient is φ = 80746812.

The previous prime is 121120199. The next prime is 121120229. The reversal of 121120221 is 122021121.

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 not a de Polignac number, because 121120221 - 2²² = 116925917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121120197 and 121120206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120229) 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, 20186701 + ... + 20186706.

It is an arithmetic number, because the mean of its divisors is an integer number (40373408).

Almost surely, 2^121120221 is an apocalyptic number.

It is an amenable number.

121120221 is a deficient number, since it is larger than the sum of its proper divisors (40373411).

121120221 is an equidigital number, since it uses as much as digits as its factorization.

121120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40373410.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 121120221 is about 11005.4632342305. The cubic root of 121120221 is about 494.7724982520.

Adding to 121120221 its reverse (122021121), we get a palindrome (243141342).

The spelling of 121120221 in words is "one hundred twenty-one million, one hundred twenty thousand, two hundred twenty-one".