22320521 has 8 divisors (see below), whose sum is σ = 22632480. Its totient is φ = 22010688.

The previous prime is 22320503. The next prime is 22320559. The reversal of 22320521 is 12502322.

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 22320521 - 2⁶ = 22320457 is a prime.

It is a super-3 number, since 3×22320521³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a plaindrome in base 3 and base 9.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 22320521.

It is not an unprimeable number, because it can be changed into a prime (22320721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35750 + ... + 36368.

It is an arithmetic number, because the mean of its divisors is an integer number (2829060).

Almost surely, 2^22320521 is an apocalyptic number.

It is an amenable number.

22320521 is a deficient number, since it is larger than the sum of its proper divisors (311959).

22320521 is a wasteful number, since it uses less digits than its factorization.

22320521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 22320521 is about 4724.4598633071. The cubic root of 22320521 is about 281.5581540310.

Adding to 22320521 its reverse (12502322), we get a palindrome (34822843).

The spelling of 22320521 in words is "twenty-two million, three hundred twenty thousand, five hundred twenty-one".