12102281 has 4 divisors (see below), whose sum is σ = 12109572. Its totient is φ = 12094992.

The previous prime is 12102271. The next prime is 12102287. The reversal of 12102281 is 18220121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3575881 + 8526400 = 1891^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102281 - 2¹⁴ = 12085897 is a prime.

It is a super-2 number, since 2×12102281² = 292930410805922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12102287) 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, 191 + ... + 4923.

It is an arithmetic number, because the mean of its divisors is an integer number (3027393).

Almost surely, 2^12102281 is an apocalyptic number.

It is an amenable number.

12102281 is a deficient number, since it is larger than the sum of its proper divisors (7291).

12102281 is an equidigital number, since it uses as much as digits as its factorization.

12102281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7290.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 12102281 is about 3478.8332814322. The cubic root of 12102281 is about 229.5914675997.

The spelling of 12102281 in words is "twelve million, one hundred two thousand, two hundred eighty-one".