221211111210 has 32 divisors (see below), whose sum is σ = 531017320320. Its totient is φ = 58977334848.

The previous prime is 221211111181. The next prime is 221211111227. The reversal of 221211111210 is 12111112122.

It is a happy number.

221211111210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221211111210³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 221211111210.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 621630 + ... + 910409.

It is an arithmetic number, because the mean of its divisors is an integer number (16594291260).

Almost surely, 2^221211111210 is an apocalyptic number.

221211111210 is an abundant number, since it is smaller than the sum of its proper divisors (309806209110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221211111210 is a wasteful number, since it uses less digits than its factorization.

221211111210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536862.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221211111210 its reverse (12111112122), we get a palindrome (233322223332).

It can be divided in two parts, 2 and 21211111210, that added together give a palindrome (21211111212).

The spelling of 221211111210 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred ten".