121442421 has 4 divisors (see below), whose sum is σ = 161923232. Its totient is φ = 80961612.

The previous prime is 121442389. The next prime is 121442437. The reversal of 121442421 is 124244121.

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: 124244121 = 3 ⋅41414707.

It is not a de Polignac number, because 121442421 - 2⁵ = 121442389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121442491) 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, 20240401 + ... + 20240406.

It is an arithmetic number, because the mean of its divisors is an integer number (40480808).

Almost surely, 2^121442421 is an apocalyptic number.

It is an amenable number.

121442421 is a deficient number, since it is larger than the sum of its proper divisors (40480811).

121442421 is an equidigital number, since it uses as much as digits as its factorization.

121442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40480810.

The product of its digits is 512, while the sum is 21.

The square root of 121442421 is about 11020.0916965332. The cubic root of 121442421 is about 495.2108356017.

Adding to 121442421 its reverse (124244121), we get a palindrome (245686542).

The spelling of 121442421 in words is "one hundred twenty-one million, four hundred forty-two thousand, four hundred twenty-one".