213111212 has 24 divisors (see below), whose sum is σ = 380933280. Its totient is φ = 104297600.

The previous prime is 213111211. The next prime is 213111221. The reversal of 213111212 is 212111312.

It is not an unprimeable number, because it can be changed into a prime (213111211) 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, 32993 + ... + 38919.

It is an arithmetic number, because the mean of its divisors is an integer number (15872220).

Almost surely, 2^213111212 is an apocalyptic number.

It is an amenable number.

213111212 is a deficient number, since it is larger than the sum of its proper divisors (167822068).

213111212 is a wasteful number, since it uses less digits than its factorization.

213111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6121 (or 6119 counting only the distinct ones).

The product of its digits is 24, while the sum is 14.

The square root of 213111212 is about 14598.3290824669. The cubic root of 213111212 is about 597.3131826095.

Adding to 213111212 its reverse (212111312), we get a palindrome (425222524).

The spelling of 213111212 in words is "two hundred thirteen million, one hundred eleven thousand, two hundred twelve".