22400221 has 4 divisors (see below), whose sum is σ = 23579200. Its totient is φ = 21221244.

The previous prime is 22400219. The next prime is 22400243. The reversal of 22400221 is 12200422.

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 a cyclic number.

It is not a de Polignac number, because 22400221 - 2¹ = 22400219 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22400251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589461 + ... + 589498.

It is an arithmetic number, because the mean of its divisors is an integer number (5894800).

Almost surely, 2^22400221 is an apocalyptic number.

It is an amenable number.

22400221 is a deficient number, since it is larger than the sum of its proper divisors (1178979).

22400221 is a wasteful number, since it uses less digits than its factorization.

22400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178978.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 22400221 is about 4732.8871738084. The cubic root of 22400221 is about 281.8928763349.

Adding to 22400221 its reverse (12200422), we get a palindrome (34600643).

The spelling of 22400221 in words is "twenty-two million, four hundred thousand, two hundred twenty-one".