221001222 has 64 divisors (see below), whose sum is σ = 496036800. Its totient is φ = 65193984.

The previous prime is 221001167. The next prime is 221001223. The reversal of 221001222 is 222100122.

It is a junction number, because it is equal to n+sod(n) for n = 221001198 and 221001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210154 + ... + 211202.

It is an arithmetic number, because the mean of its divisors is an integer number (7750575).

Almost surely, 2^221001222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221001222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248018400).

221001222 is an abundant number, since it is smaller than the sum of its proper divisors (275035578).

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

221001222 is a wasteful number, since it uses less digits than its factorization.

221001222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 221001222 is about 14866.1098475694. The cubic root of 221001222 is about 604.5954739496.

Adding to 221001222 its reverse (222100122), we get a palindrome (443101344).

It can be divided in two parts, 22100122 and 2, that multiplied together give a palindrome (44200244).

The spelling of 221001222 in words is "two hundred twenty-one million, one thousand, two hundred twenty-two".