212121111210 has 32 divisors (see below), whose sum is σ = 509243740992. Its totient is φ = 56548621440.

The previous prime is 212121111173. The next prime is 212121111211. The reversal of 212121111210 is 12111121212.

It is a happy number.

212121111210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212121111210.

It is not an unprimeable number, because it can be changed into a prime (212121111211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 961419 + ... + 1161278.

It is an arithmetic number, because the mean of its divisors is an integer number (15913866906).

Almost surely, 2^212121111210 is an apocalyptic number.

212121111210 is an abundant number, since it is smaller than the sum of its proper divisors (297122629782).

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

212121111210 is a wasteful number, since it uses less digits than its factorization.

212121111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126038.

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

Adding to 212121111210 its reverse (12111121212), we get a palindrome (224232232422).

The spelling of 212121111210 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, two hundred ten".