212031211 has 4 divisors (see below), whose sum is σ = 242321392. Its totient is φ = 181741032.

The previous prime is 212031173. The next prime is 212031251. The reversal of 212031211 is 112130212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212031211 - 2¹⁵ = 211998443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212031191 and 212031200.

It is not an unprimeable number, because it can be changed into a prime (212031251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15145080 + ... + 15145093.

It is an arithmetic number, because the mean of its divisors is an integer number (60580348).

Almost surely, 2^212031211 is an apocalyptic number.

212031211 is a deficient number, since it is larger than the sum of its proper divisors (30290181).

212031211 is an equidigital number, since it uses as much as digits as its factorization.

212031211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30290180.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 212031211 is about 14561.2915292566. The cubic root of 212031211 is about 596.3024557893.

Adding to 212031211 its reverse (112130212), we get a palindrome (324161423).

Subtracting from 212031211 its reverse (112130212), we obtain a palindrome (99900999).

The spelling of 212031211 in words is "two hundred twelve million, thirty-one thousand, two hundred eleven".