43142221 has 4 divisors (see below), whose sum is σ = 43391772. Its totient is φ = 42892672.

The previous prime is 43142213. The next prime is 43142303. The reversal of 43142221 is 12224134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34644996 + 8497225 = 5886^2 + 2915^2 .

It is a cyclic number.

It is not a de Polignac number, because 43142221 - 2³ = 43142213 is a prime.

It is a super-2 number, since 2×43142221² = 3722502465625682, 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 (43142621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124516 + ... + 124861.

It is an arithmetic number, because the mean of its divisors is an integer number (10847943).

Almost surely, 2^43142221 is an apocalyptic number.

It is an amenable number.

43142221 is a deficient number, since it is larger than the sum of its proper divisors (249551).

43142221 is a wasteful number, since it uses less digits than its factorization.

43142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249550.

The product of its digits is 384, while the sum is 19.

The square root of 43142221 is about 6568.2738219413. The cubic root of 43142221 is about 350.7256265506.

Adding to 43142221 its reverse (12224134), we get a palindrome (55366355).

The spelling of 43142221 in words is "forty-three million, one hundred forty-two thousand, two hundred twenty-one".