212131211 has 8 divisors (see below), whose sum is σ = 216616944. Its totient is φ = 207688320.

The previous prime is 212131189. The next prime is 212131223. The reversal of 212131211 is 112131212.

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 212131211 - 2²² = 207936907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212131261) 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, 605 + ... + 20606.

It is an arithmetic number, because the mean of its divisors is an integer number (27077118).

Almost surely, 2^212131211 is an apocalyptic number.

212131211 is a deficient number, since it is larger than the sum of its proper divisors (4485733).

212131211 is a wasteful number, since it uses less digits than its factorization.

212131211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21421.

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

The square root of 212131211 is about 14564.7248858329. The cubic root of 212131211 is about 596.3961855022.

Adding to 212131211 its reverse (112131212), we get a palindrome (324262423).

Subtracting from 212131211 its reverse (112131212), we obtain a palindrome (99999999).

The spelling of 212131211 in words is "two hundred twelve million, one hundred thirty-one thousand, two hundred eleven".