211321212 has 24 divisors (see below), whose sum is σ = 503575296. Its totient is φ = 68941488.

The previous prime is 211321207. The next prime is 211321213. The reversal of 211321212 is 212123112.

It is a super-2 number, since 2×211321212² = 89313309282297888, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 211321191 and 211321200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211321213) 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, 186778 + ... + 187905.

It is an arithmetic number, because the mean of its divisors is an integer number (20982304).

Almost surely, 2^211321212 is an apocalyptic number.

It is an amenable number.

211321212 is an abundant number, since it is smaller than the sum of its proper divisors (292254084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211321212 is a wasteful number, since it uses less digits than its factorization.

211321212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374737 (or 374735 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 211321212 is about 14536.8914146044. The cubic root of 211321212 is about 595.6361268547.

Adding to 211321212 its reverse (212123112), we get a palindrome (423444324).

The spelling of 211321212 in words is "two hundred eleven million, three hundred twenty-one thousand, two hundred twelve".