43143021 has 6 divisors (see below), whose sum is σ = 62317710. Its totient is φ = 28762008.

The previous prime is 43143013. The next prime is 43143049. The reversal of 43143021 is 12034134.

It can be written as a sum of positive squares in only one way, i.e., 35640900 + 7502121 = 5970^2 + 2739^2 .

It is not a de Polignac number, because 43143021 - 2³ = 43143013 is a prime.

It is a super-2 number, since 2×43143021² = 3722640522012882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43142985 and 43143003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43143071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2396826 + ... + 2396843.

It is an arithmetic number, because the mean of its divisors is an integer number (10386285).

Almost surely, 2^43143021 is an apocalyptic number.

It is an amenable number.

43143021 is a deficient number, since it is larger than the sum of its proper divisors (19174689).

43143021 is a wasteful number, since it uses less digits than its factorization.

43143021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4793675 (or 4793672 counting only the distinct ones).

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

The square root of 43143021 is about 6568.3347204600. The cubic root of 43143021 is about 350.7277944097.

Adding to 43143021 its reverse (12034134), we get a palindrome (55177155).

The spelling of 43143021 in words is "forty-three million, one hundred forty-three thousand, twenty-one".