121440121 has 4 divisors (see below), whose sum is σ = 132480144. Its totient is φ = 110400100.

The previous prime is 121440103. The next prime is 121440167. The reversal of 121440121 is 121044121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121440121 - 2¹¹ = 121438073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121440095 and 121440104.

It is not an unprimeable number, because it can be changed into a prime (121440101) 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, 5519995 + ... + 5520016.

It is an arithmetic number, because the mean of its divisors is an integer number (33120036).

Almost surely, 2^121440121 is an apocalyptic number.

121440121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121440121 is a deficient number, since it is larger than the sum of its proper divisors (11040023).

121440121 is a wasteful number, since it uses less digits than its factorization.

121440121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11040022.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 121440121 is about 11019.9873411906. The cubic root of 121440121 is about 495.2077093133.

Adding to 121440121 its reverse (121044121), we get a palindrome (242484242).

The spelling of 121440121 in words is "one hundred twenty-one million, four hundred forty thousand, one hundred twenty-one".