222221142 has 144 divisors (see below), whose sum is σ = 590943600. Its totient is φ = 59754240.

The previous prime is 222221137. The next prime is 222221143. The reversal of 222221142 is 241122222.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222221143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 970284 + ... + 970512.

It is an arithmetic number, because the mean of its divisors is an integer number (4103775).

Almost surely, 2^222221142 is an apocalyptic number.

222221142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 222221142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295471800).

222221142 is an abundant number, since it is smaller than the sum of its proper divisors (368722458).

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

222221142 is a wasteful number, since it uses less digits than its factorization.

222221142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 287 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 222221142 is about 14907.0836181998. The cubic root of 222221142 is about 605.7058828288.

Adding to 222221142 its reverse (241122222), we get a palindrome (463343364).

The spelling of 222221142 in words is "two hundred twenty-two million, two hundred twenty-one thousand, one hundred forty-two".