43222521 has 8 divisors (see below), whose sum is σ = 58224544. Its totient is φ = 28517760.

The previous prime is 43222519. The next prime is 43222537. The reversal of 43222521 is 12522234.

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

It is not a de Polignac number, because 43222521 - 2¹ = 43222519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43222591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73975 + ... + 74556.

It is an arithmetic number, because the mean of its divisors is an integer number (7278068).

Almost surely, 2^43222521 is an apocalyptic number.

It is an amenable number.

43222521 is a deficient number, since it is larger than the sum of its proper divisors (15002023).

43222521 is a wasteful number, since it uses less digits than its factorization.

43222521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148631.

The product of its digits is 960, while the sum is 21.

The square root of 43222521 is about 6574.3836973514. The cubic root of 43222521 is about 350.9430918851.

Adding to 43222521 its reverse (12522234), we get a palindrome (55744755).

The spelling of 43222521 in words is "forty-three million, two hundred twenty-two thousand, five hundred twenty-one".