22471221 has 4 divisors (see below), whose sum is σ = 29961632. Its totient is φ = 14980812.

The previous prime is 22471193. The next prime is 22471223. The reversal of 22471221 is 12217422.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22471221 - 2¹¹ = 22469173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22471223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3745201 + ... + 3745206.

It is an arithmetic number, because the mean of its divisors is an integer number (7490408).

Almost surely, 2^22471221 is an apocalyptic number.

It is an amenable number.

22471221 is a deficient number, since it is larger than the sum of its proper divisors (7490411).

22471221 is an equidigital number, since it uses as much as digits as its factorization.

22471221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7490410.

The product of its digits is 448, while the sum is 21.

The square root of 22471221 is about 4740.3819466368. The cubic root of 22471221 is about 282.1903925280.

Adding to 22471221 its reverse (12217422), we get a palindrome (34688643).

The spelling of 22471221 in words is "twenty-two million, four hundred seventy-one thousand, two hundred twenty-one".