213204222 has 96 divisors (see below), whose sum is σ = 579571200. Its totient is φ = 55028160.

The previous prime is 213204221. The next prime is 213204247. The reversal of 213204222 is 222402312.

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

It is a junction number, because it is equal to n+sod(n) for n = 213204195 and 213204204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213204221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 275428 + ... + 276200.

It is an arithmetic number, because the mean of its divisors is an integer number (6037200).

Almost surely, 2^213204222 is an apocalyptic number.

213204222 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 213204222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289785600).

213204222 is an abundant number, since it is smaller than the sum of its proper divisors (366366978).

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

213204222 is a wasteful number, since it uses less digits than its factorization.

213204222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 998 (or 995 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 213204222 is about 14601.5143735162. The cubic root of 213204222 is about 597.4000668522.

Adding to 213204222 its reverse (222402312), we get a palindrome (435606534).

The spelling of 213204222 in words is "two hundred thirteen million, two hundred four thousand, two hundred twenty-two".