212121318 has 32 divisors (see below), whose sum is σ = 443750400. Its totient is φ = 67470656.

The previous prime is 212121289. The next prime is 212121319. The reversal of 212121318 is 813121212.

212121318 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 212121294 and 212121303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64498 + ... + 67706.

It is an arithmetic number, because the mean of its divisors is an integer number (13867200).

Almost surely, 2^212121318 is an apocalyptic number.

212121318 is an abundant number, since it is smaller than the sum of its proper divisors (231629082).

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

212121318 is a wasteful number, since it uses less digits than its factorization.

212121318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716.

The product of its digits is 192, while the sum is 21.

The square root of 212121318 is about 14564.3852599415. The cubic root of 212121318 is about 596.3869141348.

The spelling of 212121318 in words is "two hundred twelve million, one hundred twenty-one thousand, three hundred eighteen".