43212123 has 20 divisors (see below), whose sum is σ = 64997328. Its totient is φ = 28609200.

The previous prime is 43212097. The next prime is 43212139. The reversal of 43212123 is 32121234.

43212123 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 43212123 - 2⁸ = 43211867 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 43212096 and 43212105.

It is not an unprimeable number, because it can be changed into a prime (43212163) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10465 + ... + 13997.

Almost surely, 2^43212123 is an apocalyptic number.

43212123 is a deficient number, since it is larger than the sum of its proper divisors (21785205).

43212123 is a wasteful number, since it uses less digits than its factorization.

43212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696 (or 3687 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 43212123 is about 6573.5928532272. The cubic root of 43212123 is about 350.9149476149.

Adding to 43212123 its reverse (32121234), we get a palindrome (75333357).

The spelling of 43212123 in words is "forty-three million, two hundred twelve thousand, one hundred twenty-three".