221221122 has 8 divisors (see below), whose sum is σ = 442442256. Its totient is φ = 73740372.

The previous prime is 221221097. The next prime is 221221127. The reversal of 221221122 is 221122122.

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

221221122 is an admirable number.

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

It is not an unprimeable number, because it can be changed into a prime (221221127) 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, 18435088 + ... + 18435099.

It is an arithmetic number, because the mean of its divisors is an integer number (55305282).

Almost surely, 2^221221122 is an apocalyptic number.

221221122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221221122 is a wasteful number, since it uses less digits than its factorization.

221221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36870192.

The product of its digits is 64, while the sum is 15.

The square root of 221221122 is about 14873.5040256155. The cubic root of 221221122 is about 604.7959350931.

Adding to 221221122 its reverse (221122122), we get a palindrome (442343244).

It can be divided in two parts, 221221 and 122, that multiplied together give a palindrome (26988962).

The spelling of 221221122 in words is "two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".