12143921 has 4 divisors (see below), whose sum is σ = 12156144. Its totient is φ = 12131700.

The previous prime is 12143891. The next prime is 12143927. The reversal of 12143921 is 12934121.

12143921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 12934121 = 601 ⋅21521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12143921 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 (12143927) 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, 4475 + ... + 6656.

It is an arithmetic number, because the mean of its divisors is an integer number (3039036).

Almost surely, 2^12143921 is an apocalyptic number.

It is an amenable number.

12143921 is a deficient number, since it is larger than the sum of its proper divisors (12223).

12143921 is a wasteful number, since it uses less digits than its factorization.

12143921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12222.

The product of its digits is 432, while the sum is 23.

The square root of 12143921 is about 3484.8129074600. The cubic root of 12143921 is about 229.8544826221.

The spelling of 12143921 in words is "twelve million, one hundred forty-three thousand, nine hundred twenty-one".