213121112 has 16 divisors (see below), whose sum is σ = 423108360. Its totient is φ = 100292224.

The previous prime is 213121093. The next prime is 213121123. The reversal of 213121112 is 211121312.

213121112 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 783398 + ... + 783669.

Almost surely, 2^213121112 is an apocalyptic number.

It is an amenable number.

213121112 is a deficient number, since it is larger than the sum of its proper divisors (209987248).

213121112 is a wasteful number, since it uses less digits than its factorization.

213121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567090 (or 1567086 counting only the distinct ones).

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

The square root of 213121112 is about 14598.6681584314. The cubic root of 213121112 is about 597.3224317849.

Adding to 213121112 its reverse (211121312), we get a palindrome (424242424).

The spelling of 213121112 in words is "two hundred thirteen million, one hundred twenty-one thousand, one hundred twelve".