212021211 has 8 divisors (see below), whose sum is σ = 290335504. Its totient is φ = 137527200.

The previous prime is 212021203. The next prime is 212021213. The reversal of 212021211 is 112120212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212021211 - 2³ = 212021203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212021213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 954940 + ... + 955161.

It is an arithmetic number, because the mean of its divisors is an integer number (36291938).

Almost surely, 2^212021211 is an apocalyptic number.

212021211 is a deficient number, since it is larger than the sum of its proper divisors (78314293).

212021211 is a wasteful number, since it uses less digits than its factorization.

212021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910141.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 212021211 is about 14560.9481490733. The cubic root of 212021211 is about 596.2930811973.

Adding to 212021211 its reverse (112120212), we get a palindrome (324141423).

Subtracting from 212021211 its reverse (112120212), we obtain a palindrome (99900999).

It can be divided in two parts, 2120212 and 11, that multiplied together give a palindrome (23322332).

The spelling of 212021211 in words is "two hundred twelve million, twenty-one thousand, two hundred eleven".