12143021 has 4 divisors (see below), whose sum is σ = 13246944. Its totient is φ = 11039100.

The previous prime is 12143017. The next prime is 12143023. The reversal of 12143021 is 12034121.

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: 12034121 = 11 ⋅1094011.

It is a cyclic number.

It is not a de Polignac number, because 12143021 - 2² = 12143017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12142987 and 12143005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12143023) 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, 551945 + ... + 551966.

It is an arithmetic number, because the mean of its divisors is an integer number (3311736).

Almost surely, 2^12143021 is an apocalyptic number.

12143021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12143021 is a deficient number, since it is larger than the sum of its proper divisors (1103923).

12143021 is a wasteful number, since it uses less digits than its factorization.

12143021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103922.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 12143021 is about 3484.6837733143. The cubic root of 12143021 is about 229.8488042214.

Adding to 12143021 its reverse (12034121), we get a palindrome (24177142).

Subtracting from 12143021 its reverse (12034121), we obtain a square (108900 = 330²).

The spelling of 12143021 in words is "twelve million, one hundred forty-three thousand, twenty-one".