43371721 has 8 divisors (see below), whose sum is σ = 45549504. Its totient is φ = 41218320.

The previous prime is 43371703. The next prime is 43371751. The reversal of 43371721 is 12717334.

43371721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43371721 - 2⁵ = 43371689 is a prime.

It is a super-2 number, since 2×43371721² = 3762212365003682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43371721.

It is not an unprimeable number, because it can be changed into a prime (43371751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2395 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (5693688).

Almost surely, 2^43371721 is an apocalyptic number.

It is an amenable number.

43371721 is a deficient number, since it is larger than the sum of its proper divisors (2177783).

43371721 is a wasteful number, since it uses less digits than its factorization.

43371721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12191.

The product of its digits is 3528, while the sum is 28.

The square root of 43371721 is about 6585.7209931791. The cubic root of 43371721 is about 351.3464354455.

The spelling of 43371721 in words is "forty-three million, three hundred seventy-one thousand, seven hundred twenty-one".