212121111120 has 80 divisors (see below), whose sum is σ = 659459875200. Its totient is φ = 56403528192.

The previous prime is 212121111107. The next prime is 212121111151. The reversal of 212121111120 is 21111121212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 212121111120.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1182484 + ... + 1350003.

It is an arithmetic number, because the mean of its divisors is an integer number (8243248440).

Almost surely, 2^212121111120 is an apocalyptic number.

212121111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121111120 is an abundant number, since it is smaller than the sum of its proper divisors (447338764080).

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

212121111120 is a wasteful number, since it uses less digits than its factorization.

212121111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2532852 (or 2532846 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 212121111120 its reverse (21111121212), we get a palindrome (233232232332).

The spelling of 212121111120 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred twenty".