212121313 has 8 divisors (see below), whose sum is σ = 219453696. Its totient is φ = 204819600.

The previous prime is 212121289. The next prime is 212121319. The reversal of 212121313 is 313121212.

212121313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212121313 - 2²¹ = 210024161 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 6870 + ... + 21712.

It is an arithmetic number, because the mean of its divisors is an integer number (27431712).

Almost surely, 2^212121313 is an apocalyptic number.

It is an amenable number.

212121313 is a deficient number, since it is larger than the sum of its proper divisors (7332383).

212121313 is a wasteful number, since it uses less digits than its factorization.

212121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15335.

The product of its digits is 72, while the sum is 16.

The square root of 212121313 is about 14564.3850882899. The cubic root of 212121313 is about 596.3869094489.

Adding to 212121313 its reverse (313121212), we get a palindrome (525242525).

The spelling of 212121313 in words is "two hundred twelve million, one hundred twenty-one thousand, three hundred thirteen".