121101221 has 8 divisors (see below), whose sum is σ = 126770688. Its totient is φ = 115542000.

The previous prime is 121101203. The next prime is 121101229. The reversal of 121101221 is 122101121.

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

It is a cyclic number.

It is not a de Polignac number, because 121101221 - 2⁶ = 121101157 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 (121101229) 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, 25310 + ... + 29711.

It is an arithmetic number, because the mean of its divisors is an integer number (15846336).

Almost surely, 2^121101221 is an apocalyptic number.

It is an amenable number.

121101221 is a deficient number, since it is larger than the sum of its proper divisors (5669467).

121101221 is an equidigital number, since it uses as much as digits as its factorization.

121101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55123.

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

The square root of 121101221 is about 11004.5999927303. The cubic root of 121101221 is about 494.7466254208.

Adding to 121101221 its reverse (122101121), we get a palindrome (243202342).

It can be divided in two parts, 12110 and 1221, that added together give a palindrome (13331).

The spelling of 121101221 in words is "one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".