213231223212 has 96 divisors (see below), whose sum is σ = 572189409792. Its totient is φ = 60541157376.

The previous prime is 213231223189. The next prime is 213231223223. The reversal of 213231223212 is 212322132312.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14604588 + ... + 14619180.

It is an arithmetic number, because the mean of its divisors is an integer number (5960306352).

Almost surely, 2^213231223212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213231223212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286094704896).

213231223212 is an abundant number, since it is smaller than the sum of its proper divisors (358958186580).

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

213231223212 is a wasteful number, since it uses less digits than its factorization.

213231223212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15687 (or 15685 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 213231223212 its reverse (212322132312), we get a palindrome (425553355524).

The spelling of 213231223212 in words is "two hundred thirteen billion, two hundred thirty-one million, two hundred twenty-three thousand, two hundred twelve".