21212210211 has 8 divisors (see below), whose sum is σ = 28746602064. Its totient is φ = 13909645920.

The previous prime is 21212210209. The next prime is 21212210213. The reversal of 21212210211 is 11201221212.

It is an interprime number because it is at equal distance from previous prime (21212210209) and next prime (21212210213).

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

It is not a de Polignac number, because 21212210211 - 2¹ = 21212210209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212210213) 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, 57956676 + ... + 57957041.

It is an arithmetic number, because the mean of its divisors is an integer number (3593325258).

Almost surely, 2^21212210211 is an apocalyptic number.

21212210211 is a deficient number, since it is larger than the sum of its proper divisors (7534391853).

21212210211 is a wasteful number, since it uses less digits than its factorization.

21212210211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115913781.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212210211 its reverse (11201221212), we get a palindrome (32413431423).

The spelling of 21212210211 in words is "twenty-one billion, two hundred twelve million, two hundred ten thousand, two hundred eleven".