221217122 has 8 divisors (see below), whose sum is σ = 379229376. Its totient is φ = 94807332.

The previous prime is 221217103. The next prime is 221217127. The reversal of 221217122 is 221712122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 221217094 and 221217103.

It is not an unprimeable number, because it can be changed into a prime (221217127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7900598 + ... + 7900625.

It is an arithmetic number, because the mean of its divisors is an integer number (47403672).

Almost surely, 2^221217122 is an apocalyptic number.

221217122 is a deficient number, since it is larger than the sum of its proper divisors (158012254).

221217122 is a wasteful number, since it uses less digits than its factorization.

221217122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15801232.

The product of its digits is 224, while the sum is 20.

The square root of 221217122 is about 14873.3695577028. The cubic root of 221217122 is about 604.7922898741.

Adding to 221217122 its reverse (221712122), we get a palindrome (442929244).

The spelling of 221217122 in words is "two hundred twenty-one million, two hundred seventeen thousand, one hundred twenty-two".