222100001 has 4 divisors (see below), whose sum is σ = 223070100. Its totient is φ = 221129904.

The previous prime is 222099991. The next prime is 222100037. The reversal of 222100001 is 100001222.

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 174213601 + 47886400 = 13199^2 + 6920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222105001) 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, 484706 + ... + 485163.

It is an arithmetic number, because the mean of its divisors is an integer number (55767525).

Almost surely, 2^222100001 is an apocalyptic number.

It is an amenable number.

222100001 is a deficient number, since it is larger than the sum of its proper divisors (970099).

222100001 is an equidigital number, since it uses as much as digits as its factorization.

222100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970098.

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

The square root of 222100001 is about 14903.0198617596. The cubic root of 222100001 is about 605.5957985631.

Adding to 222100001 its reverse (100001222), we get a palindrome (322101223).

It can be divided in two parts, 222 and 100001, that multiplied together give a palindrome (22200222).

The spelling of 222100001 in words is "two hundred twenty-two million, one hundred thousand, one".