22015221 has 8 divisors (see below), whose sum is σ = 31080384. Its totient is φ = 13813440.

The previous prime is 22015219. The next prime is 22015241. The reversal of 22015221 is 12251022.

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

It is not a de Polignac number, because 22015221 - 2¹ = 22015219 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22015221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22015241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215785 + ... + 215886.

It is an arithmetic number, because the mean of its divisors is an integer number (3885048).

Almost surely, 2^22015221 is an apocalyptic number.

It is an amenable number.

22015221 is a deficient number, since it is larger than the sum of its proper divisors (9065163).

22015221 is a wasteful number, since it uses less digits than its factorization.

22015221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431691.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 22015221 is about 4692.0380433240. The cubic root of 22015221 is about 280.2685391390.

Adding to 22015221 its reverse (12251022), we get a palindrome (34266243).

The spelling of 22015221 in words is "twenty-two million, fifteen thousand, two hundred twenty-one".