12120033421 has 4 divisors (see below), whose sum is σ = 12128636700. Its totient is φ = 12111430144.

The previous prime is 12120033413. The next prime is 12120033469. The reversal of 12120033421 is 12433002121.

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: 12433002121 = 1913 ⋅6499217.

It can be written as a sum of positive squares in 2 ways, for example, as 3365624196 + 8754409225 = 58014^2 + 93565^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120033421 - 2³ = 12120033413 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 (12120033221) 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, 4299526 + ... + 4302343.

It is an arithmetic number, because the mean of its divisors is an integer number (3032159175).

Almost surely, 2^12120033421 is an apocalyptic number.

It is an amenable number.

12120033421 is a deficient number, since it is larger than the sum of its proper divisors (8603279).

12120033421 is an equidigital number, since it uses as much as digits as its factorization.

12120033421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8603278.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 12120033421 its reverse (12433002121), we get a palindrome (24553035542).

The spelling of 12120033421 in words is "twelve billion, one hundred twenty million, thirty-three thousand, four hundred twenty-one".