22208421 has 8 divisors (see below), whose sum is σ = 29673504. Its totient is φ = 14774480.

The previous prime is 22208419. The next prime is 22208449. The reversal of 22208421 is 12480222.

It is a happy number.

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 22208421 - 2¹ = 22208419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22208411) 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, 6066 + ... + 9011.

It is an arithmetic number, because the mean of its divisors is an integer number (3709188).

Almost surely, 2^22208421 is an apocalyptic number.

It is an amenable number.

22208421 is a deficient number, since it is larger than the sum of its proper divisors (7465083).

22208421 is a wasteful number, since it uses less digits than its factorization.

22208421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15571.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 22208421 is about 4712.5811398850. The cubic root of 22208421 is about 281.0860077060.

Adding to 22208421 its reverse (12480222), we get a palindrome (34688643).

The spelling of 22208421 in words is "twenty-two million, two hundred eight thousand, four hundred twenty-one".