43521057 has 12 divisors (see below), whose sum is σ = 65192400. Its totient is φ = 29013876.

The previous prime is 43521053. The next prime is 43521059. The reversal of 43521057 is 75012534.

It is a happy number.

It is not a de Polignac number, because 43521057 - 2² = 43521053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 43521057.

It is not an unprimeable number, because it can be changed into a prime (43521053) 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, 89307 + ... + 89792.

It is an arithmetic number, because the mean of its divisors is an integer number (5432700).

Almost surely, 2^43521057 is an apocalyptic number.

It is an amenable number.

43521057 is a deficient number, since it is larger than the sum of its proper divisors (21671343).

43521057 is an equidigital number, since it uses as much as digits as its factorization.

43521057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179114 (or 179102 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 43521057 is about 6597.0491130505. The cubic root of 43521057 is about 351.7492214512.

It can be divided in two parts, 4352 and 1057, that multiplied together give a palindrome (4600064).

The spelling of 43521057 in words is "forty-three million, five hundred twenty-one thousand, fifty-seven".