212123211312 has 40 divisors (see below), whose sum is σ = 548002028800. Its totient is φ = 70705535040.

The previous prime is 212123211299. The next prime is 212123211343. The reversal of 212123211312 is 213112321212.

It is a super-2 number, since 2×212123211312² (a number of 23 digits) contains 22 as substring.

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

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2406189 + ... + 2492787.

It is an arithmetic number, because the mean of its divisors is an integer number (13700050720).

Almost surely, 2^212123211312 is an apocalyptic number.

It is an amenable number.

212123211312 is an abundant number, since it is smaller than the sum of its proper divisors (335878817488).

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

212123211312 is a wasteful number, since it uses less digits than its factorization.

212123211312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137641 (or 137635 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 212123211312 its reverse (213112321212), we get a palindrome (425235532524).

The spelling of 212123211312 in words is "two hundred twelve billion, one hundred twenty-three million, two hundred eleven thousand, three hundred twelve".