121442111 has 16 divisors (see below), whose sum is σ = 144944640. Its totient is φ = 99546720.

The previous prime is 121442107. The next prime is 121442149. The reversal of 121442111 is 111244121.

It is not a de Polignac number, because 121442111 - 2² = 121442107 is a prime.

It is a super-3 number, since 3×121442111³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121442111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121442171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18926 + ... + 24516.

It is an arithmetic number, because the mean of its divisors is an integer number (9059040).

Almost surely, 2^121442111 is an apocalyptic number.

121442111 is a deficient number, since it is larger than the sum of its proper divisors (23502529).

121442111 is a wasteful number, since it uses less digits than its factorization.

121442111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5734.

The product of its digits is 64, while the sum is 17.

The square root of 121442111 is about 11020.0776313055. The cubic root of 121442111 is about 495.2104142347.

Adding to 121442111 its reverse (111244121), we get a palindrome (232686232).

The spelling of 121442111 in words is "one hundred twenty-one million, four hundred forty-two thousand, one hundred eleven".