22218001 has 4 divisors (see below), whose sum is σ = 23927092. Its totient is φ = 20508912.

The previous prime is 22217999. The next prime is 22218037. The reversal of 22218001 is 10081222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10246401 + 11971600 = 3201^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 22218001 - 2¹ = 22217999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22218601) 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, 854526 + ... + 854551.

It is an arithmetic number, because the mean of its divisors is an integer number (5981773).

Almost surely, 2^22218001 is an apocalyptic number.

It is an amenable number.

22218001 is a deficient number, since it is larger than the sum of its proper divisors (1709091).

22218001 is a wasteful number, since it uses less digits than its factorization.

22218001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709090.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 22218001 is about 4713.5974584175. The cubic root of 22218001 is about 281.1264190564.

Adding to 22218001 its reverse (10081222), we get a palindrome (32299223).

The spelling of 22218001 in words is "twenty-two million, two hundred eighteen thousand, one".