43521012 has 36 divisors (see below), whose sum is σ = 111567456. Its totient is φ = 14301840.

The previous prime is 43521011. The next prime is 43521047. The reversal of 43521012 is 21012534.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43521011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5958 + ... + 11069.

It is an arithmetic number, because the mean of its divisors is an integer number (3099096).

Almost surely, 2^43521012 is an apocalyptic number.

It is an amenable number.

43521012 is an abundant number, since it is smaller than the sum of its proper divisors (68046444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

43521012 is a wasteful number, since it uses less digits than its factorization.

43521012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17108 (or 17103 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 43521012 is about 6597.0457024338. The cubic root of 43521012 is about 351.7491002170.

Adding to 43521012 its reverse (21012534), we get a palindrome (64533546).

The spelling of 43521012 in words is "forty-three million, five hundred twenty-one thousand, twelve".