211213312 has 22 divisors (see below), whose sum is σ = 422222408. Its totient is φ = 105606144.

The previous prime is 211213297. The next prime is 211213313. The reversal of 211213312 is 213312112.

It is a super-2 number, since 2×211213312² = 89222126332018688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211213313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102108 + ... + 104155.

Almost surely, 2^211213312 is an apocalyptic number.

It is an amenable number.

211213312 is a deficient number, since it is larger than the sum of its proper divisors (211009096).

211213312 is an equidigital number, since it uses as much as digits as its factorization.

211213312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206283 (or 206265 counting only the distinct ones).

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

The square root of 211213312 is about 14533.1796933775. The cubic root of 211213312 is about 595.5347329007.

Adding to 211213312 its reverse (213312112), we get a palindrome (424525424).

The spelling of 211213312 in words is "two hundred eleven million, two hundred thirteen thousand, three hundred twelve".