212121344512 has 160 divisors (see below), whose sum is σ = 539656888320. Its totient is φ = 80885575680.

The previous prime is 212121344497. The next prime is 212121344537. The reversal of 212121344512 is 215443121212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1795689 + ... + 1910167.

It is an arithmetic number, because the mean of its divisors is an integer number (3372855552).

Almost surely, 2^212121344512 is an apocalyptic number.

212121344512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212121344512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269828444160).

212121344512 is an abundant number, since it is smaller than the sum of its proper divisors (327535543808).

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

212121344512 is a wasteful number, since it uses less digits than its factorization.

212121344512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114562 (or 114546 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

Adding to 212121344512 its reverse (215443121212), we get a palindrome (427564465724).

The spelling of 212121344512 in words is "two hundred twelve billion, one hundred twenty-one million, three hundred forty-four thousand, five hundred twelve".