121344421 has 4 divisors (see below), whose sum is σ = 132375744. Its totient is φ = 110313100.

The previous prime is 121344407. The next prime is 121344451. The reversal of 121344421 is 124443121.

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 a de Polignac number, because none of the positive numbers 2^k-121344421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121344392 and 121344401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121344451) 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, 5515645 + ... + 5515666.

It is an arithmetic number, because the mean of its divisors is an integer number (33093936).

Almost surely, 2^121344421 is an apocalyptic number.

121344421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121344421 is a deficient number, since it is larger than the sum of its proper divisors (11031323).

121344421 is a wasteful number, since it uses less digits than its factorization.

121344421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11031322.

The product of its digits is 768, while the sum is 22.

The square root of 121344421 is about 11015.6443751603. The cubic root of 121344421 is about 495.0775935227.

Adding to 121344421 its reverse (124443121), we get a palindrome (245787542).

The spelling of 121344421 in words is "one hundred twenty-one million, three hundred forty-four thousand, four hundred twenty-one".