12042281 has 4 divisors (see below), whose sum is σ = 12050064. Its totient is φ = 12034500.

The previous prime is 12042269. The next prime is 12042287. The reversal of 12042281 is 18224021.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18224021 = 19 ⋅959159.

It is a cyclic number.

It is not a de Polignac number, because 12042281 - 2¹⁰ = 12041257 is a prime.

It is a super-2 number, since 2×12042281² = 290033063365922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12042287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695 + ... + 4956.

It is an arithmetic number, because the mean of its divisors is an integer number (3012516).

Almost surely, 2^12042281 is an apocalyptic number.

It is an amenable number.

12042281 is a deficient number, since it is larger than the sum of its proper divisors (7783).

12042281 is an equidigital number, since it uses as much as digits as its factorization.

12042281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7782.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 12042281 is about 3470.1989856491. The cubic root of 12042281 is about 229.2114203431.

The spelling of 12042281 in words is "twelve million, forty-two thousand, two hundred eighty-one".