22218401 has 8 divisors (see below), whose sum is σ = 22803264. Its totient is φ = 21636720.

The previous prime is 22218377. The next prime is 22218403. The reversal of 22218401 is 10481222.

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 a de Polignac number, because none of the positive numbers 2^k-22218401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22218403) 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, 20411 + ... + 21471.

It is an arithmetic number, because the mean of its divisors is an integer number (2850408).

Almost surely, 2^22218401 is an apocalyptic number.

It is an amenable number.

22218401 is a deficient number, since it is larger than the sum of its proper divisors (584863).

22218401 is a wasteful number, since it uses less digits than its factorization.

22218401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 22218401 is about 4713.6398886635. The cubic root of 22218401 is about 281.1281061253.

Adding to 22218401 its reverse (10481222), we get a palindrome (32699623).

The spelling of 22218401 in words is "twenty-two million, two hundred eighteen thousand, four hundred one".