213231222 has 48 divisors (see below), whose sum is σ = 478413312. Its totient is φ = 68584320.

The previous prime is 213231197. The next prime is 213231353. The reversal of 213231222 is 222132312.

213231222 is a `hidden beast` number, since 213 + 231 + 222 = 666.

It is a super-2 number, since 2×213231222² = 90935108071226568, which contains 22 as substring.

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

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 = 213231195 and 213231204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83322 + ... + 85842.

It is an arithmetic number, because the mean of its divisors is an integer number (9966944).

Almost surely, 2^213231222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213231222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239206656).

213231222 is an abundant number, since it is smaller than the sum of its proper divisors (265182090).

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

213231222 is a wasteful number, since it uses less digits than its factorization.

213231222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693 (or 2690 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 213231222 is about 14602.4389058814. The cubic root of 213231222 is about 597.4252838653.

Adding to 213231222 its reverse (222132312), we get a palindrome (435363534).

The spelling of 213231222 in words is "two hundred thirteen million, two hundred thirty-one thousand, two hundred twenty-two".