22043521 has 8 divisors (see below), whose sum is σ = 22508640. Its totient is φ = 21581568.

The previous prime is 22043513. The next prime is 22043533. The reversal of 22043521 is 12534022.

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 22043521 - 2³ = 22043513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22043551) 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, 17505 + ... + 18721.

It is an arithmetic number, because the mean of its divisors is an integer number (2813580).

Almost surely, 2^22043521 is an apocalyptic number.

It is an amenable number.

22043521 is a deficient number, since it is larger than the sum of its proper divisors (465119).

22043521 is a wasteful number, since it uses less digits than its factorization.

22043521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 22043521 is about 4695.0528218541. The cubic root of 22043521 is about 280.3885803817.

Adding to 22043521 its reverse (12534022), we get a palindrome (34577543).

The spelling of 22043521 in words is "twenty-two million, forty-three thousand, five hundred twenty-one".