121240121 has 4 divisors (see below), whose sum is σ = 127621200. Its totient is φ = 114859044.

The previous prime is 121240099. The next prime is 121240129. The reversal of 121240121 is 121042121.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121042121 = 181 ⋅668741.

It is a cyclic number.

It is not a de Polignac number, because 121240121 - 2⁶ = 121240057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121240096 and 121240105.

It is not an unprimeable number, because it can be changed into a prime (121240129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3190511 + ... + 3190548.

It is an arithmetic number, because the mean of its divisors is an integer number (31905300).

Almost surely, 2^121240121 is an apocalyptic number.

It is an amenable number.

121240121 is a deficient number, since it is larger than the sum of its proper divisors (6381079).

121240121 is an equidigital number, since it uses as much as digits as its factorization.

121240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6381078.

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

The square root of 121240121 is about 11010.9091813528. The cubic root of 121240121 is about 494.9357070529.

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

The spelling of 121240121 in words is "one hundred twenty-one million, two hundred forty thousand, one hundred twenty-one".