22216401 has 12 divisors (see below), whose sum is σ = 32245200. Its totient is φ = 14739480.

The previous prime is 22216387. The next prime is 22216409. The reversal of 22216401 is 10461222.

22216401 is a `hidden beast` number, since 2 + 2 + 21 + 640 + 1 = 666.

It is not a de Polignac number, because 22216401 - 2¹⁹ = 21692113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22216409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3951 + ... + 7748.

It is an arithmetic number, because the mean of its divisors is an integer number (2687100).

Almost surely, 2^22216401 is an apocalyptic number.

It is an amenable number.

22216401 is a deficient number, since it is larger than the sum of its proper divisors (10028799).

22216401 is a wasteful number, since it uses less digits than its factorization.

22216401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11916 (or 11913 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 22216401 is about 4713.4277336138. The cubic root of 22216401 is about 281.1196705785.

Adding to 22216401 its reverse (10461222), we get a palindrome (32677623).

The spelling of 22216401 in words is "twenty-two million, two hundred sixteen thousand, four hundred one".