212121332 has 12 divisors (see below), whose sum is σ = 371316036. Its totient is φ = 106031040.

The previous prime is 212121319. The next prime is 212121379. The reversal of 212121332 is 233121212.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 195832036 = 4036^2 + 13994^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 212121332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19832 + ... + 28592.

It is an arithmetic number, because the mean of its divisors is an integer number (30943003).

Almost surely, 2^212121332 is an apocalyptic number.

It is an amenable number.

212121332 is a deficient number, since it is larger than the sum of its proper divisors (159194704).

212121332 is a wasteful number, since it uses less digits than its factorization.

212121332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14818 (or 14816 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 212121332 is about 14564.3857405659. The cubic root of 212121332 is about 596.3869272553.

Adding to 212121332 its reverse (233121212), we get a palindrome (445242544).

The spelling of 212121332 in words is "two hundred twelve million, one hundred twenty-one thousand, three hundred thirty-two".