12182921 has 4 divisors (see below), whose sum is σ = 12202512. Its totient is φ = 12163332.

The previous prime is 12182903. The next prime is 12182941. The reversal of 12182921 is 12928121.

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 not a de Polignac number, because 12182921 - 2¹⁴ = 12166537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12182941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8831 + ... + 10116.

It is an arithmetic number, because the mean of its divisors is an integer number (3050628).

Almost surely, 2^12182921 is an apocalyptic number.

It is an amenable number.

12182921 is a deficient number, since it is larger than the sum of its proper divisors (19591).

12182921 is an equidigital number, since it uses as much as digits as its factorization.

12182921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19590.

The product of its digits is 576, while the sum is 26.

The square root of 12182921 is about 3490.4041313292. The cubic root of 12182921 is about 230.1002776347.

It can be divided in two parts, 1218 and 2921, that multiplied together give a triangular number (3557778 = T₂₆₆₇).

The spelling of 12182921 in words is "twelve million, one hundred eighty-two thousand, nine hundred twenty-one".