43143221 has 16 divisors (see below), whose sum is σ = 49051008. Its totient is φ = 37598400.

The previous prime is 43143211. The next prime is 43143241. The reversal of 43143221 is 12234134.

It is a cyclic number.

It is not a de Polignac number, because 43143221 - 2⁶ = 43143157 is a prime.

It is a super-2 number, since 2×43143221² = 3722675036509682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43143193 and 43143202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43143211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28151 + ... + 29643.

It is an arithmetic number, because the mean of its divisors is an integer number (3065688).

Almost surely, 2^43143221 is an apocalyptic number.

It is an amenable number.

43143221 is a deficient number, since it is larger than the sum of its proper divisors (5907787).

43143221 is a wasteful number, since it uses less digits than its factorization.

43143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612.

The product of its digits is 576, while the sum is 20.

The square root of 43143221 is about 6568.3499450014. The cubic root of 43143221 is about 350.7283363703.

Adding to 43143221 its reverse (12234134), we get a palindrome (55377355).

The spelling of 43143221 in words is "forty-three million, one hundred forty-three thousand, two hundred twenty-one".