22112001 has 8 divisors (see below), whose sum is σ = 32758560. Its totient is φ = 14741316.

The previous prime is 22111979. The next prime is 22112003. The reversal of 22112001 is 10021122.

It is not a de Polignac number, because 22112001 - 2¹¹ = 22109953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22112003) 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, 409455 + ... + 409508.

It is an arithmetic number, because the mean of its divisors is an integer number (4094820).

Almost surely, 2^22112001 is an apocalyptic number.

It is an amenable number.

22112001 is a deficient number, since it is larger than the sum of its proper divisors (10646559).

22112001 is an equidigital number, since it uses as much as digits as its factorization.

22112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818972 (or 818966 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 22112001 is about 4702.3399494294. The cubic root of 22112001 is about 280.6786302495.

Adding to 22112001 its reverse (10021122), we get a palindrome (32133123).

The spelling of 22112001 in words is "twenty-two million, one hundred twelve thousand, one".