212121212122 has 4 divisors (see below), whose sum is σ = 318181818186. Its totient is φ = 106060606060.

The previous prime is 212121212101. The next prime is 212121212123. The reversal of 212121212122 is 221212121212.

212121212122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 176878283761 + 35242928361 = 420569^2 + 187731^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 212121212122.

It is not an unprimeable number, because it can be changed into a prime (212121212123) 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 as a sum of consecutive naturals, namely, 53030303029 + ... + 53030303032.

Almost surely, 2^212121212122 is an apocalyptic number.

212121212122 is a deficient number, since it is larger than the sum of its proper divisors (106060606064).

212121212122 is a wasteful number, since it uses less digits than its factorization.

212121212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106060606063.

The product of its digits is 128, while the sum is 19.

Adding to 212121212122 its reverse (221212121212), we get a palindrome (433333333334).

It can be divided in two parts, 21212121212 and 2, that multiplied together give a palindrome (42424242424).

The spelling of 212121212122 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty-two".