121042121 has 4 divisors (see below), whose sum is σ = 121711044. Its totient is φ = 120373200.

The previous prime is 121042111. The next prime is 121042139. The reversal of 121042121 is 121240121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121240121 = 19 ⋅6381059.

It can be written as a sum of positive squares in 2 ways, for example, as 19758025 + 101284096 = 4445^2 + 10064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121042121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121042096 and 121042105.

It is not an unprimeable number, because it can be changed into a prime (121042111) 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, 334190 + ... + 334551.

It is an arithmetic number, because the mean of its divisors is an integer number (30427761).

Almost surely, 2^121042121 is an apocalyptic number.

It is an amenable number.

121042121 is a deficient number, since it is larger than the sum of its proper divisors (668923).

121042121 is an equidigital number, since it uses as much as digits as its factorization.

121042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668922.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 121042121 is about 11001.9144243173. The cubic root of 121042121 is about 494.6661299942. Note that the first 3 decimals are identical.

Adding to 121042121 its reverse (121240121), we get a palindrome (242282242).

The spelling of 121042121 in words is "one hundred twenty-one million, forty-two thousand, one hundred twenty-one".