12021943 has 4 divisors (see below), whose sum is σ = 12091608. Its totient is φ = 11952280.

The previous prime is 12021923. The next prime is 12021953. The reversal of 12021943 is 34912021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34912021 = 233 ⋅149837.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021943 is a prime.

It is a super-2 number, since 2×12021943² = 289054226990498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021913) 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, 34573 + ... + 34918.

It is an arithmetic number, because the mean of its divisors is an integer number (3022902).

Almost surely, 2^12021943 is an apocalyptic number.

12021943 is a deficient number, since it is larger than the sum of its proper divisors (69665).

12021943 is an equidigital number, since it uses as much as digits as its factorization.

12021943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69664.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12021943 is about 3467.2673678273. The cubic root of 12021943 is about 229.0823105649.

Adding to 12021943 its reverse (34912021), we get a palindrome (46933964).

The spelling of 12021943 in words is "twelve million, twenty-one thousand, nine hundred forty-three".