211221212210 has 8 divisors (see below), whose sum is σ = 380198181996. Its totient is φ = 84488484880.

The previous prime is 211221212173. The next prime is 211221212219. The reversal of 211221212210 is 12212122112.

211221212210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 184349150881 + 26872061329 = 429359^2 + 163927^2 .

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

It is a super-2 number, since 2×211221212210² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211221212219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10561060601 + ... + 10561060620.

Almost surely, 2^211221212210 is an apocalyptic number.

211221212210 is a deficient number, since it is larger than the sum of its proper divisors (168976969786).

211221212210 is a wasteful number, since it uses less digits than its factorization.

211221212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21122121228.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211221212210 its reverse (12212122112), we get a palindrome (223433334322).

The spelling of 211221212210 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, two hundred ten".