43521345 has 24 divisors (see below), whose sum is σ = 86214336. Its totient is φ = 19895328.

The previous prime is 43521319. The next prime is 43521353. The reversal of 43521345 is 54312534.

It is not a de Polignac number, because 43521345 - 2¹¹ = 43519297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68767 + ... + 69396.

It is an arithmetic number, because the mean of its divisors is an integer number (3592264).

Almost surely, 2^43521345 is an apocalyptic number.

43521345 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43521345 is a deficient number, since it is larger than the sum of its proper divisors (42692991).

43521345 is a wasteful number, since it uses less digits than its factorization.

43521345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138181 (or 138178 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 43521345 is about 6597.0709409555. The cubic root of 43521345 is about 351.7499973480.

Adding to 43521345 its reverse (54312534), we get a palindrome (97833879).

The spelling of 43521345 in words is "forty-three million, five hundred twenty-one thousand, three hundred forty-five".