211221102210 has 32 divisors (see below), whose sum is σ = 510332875200. Its totient is φ = 55947601728.

The previous prime is 211221102181. The next prime is 211221102221. The reversal of 211221102210 is 12201122112.

It is a super-2 number, since 2×211221102210² (a number of 23 digits) contains 22 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 211221102210.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23622052 + ... + 23630991.

It is an arithmetic number, because the mean of its divisors is an integer number (15947902350).

Almost surely, 2^211221102210 is an apocalyptic number.

211221102210 is an abundant number, since it is smaller than the sum of its proper divisors (299111772990).

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

211221102210 is a wasteful number, since it uses less digits than its factorization.

211221102210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47253202.

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

Adding to 211221102210 its reverse (12201122112), we get a palindrome (223422224322).

The spelling of 211221102210 in words is "two hundred eleven billion, two hundred twenty-one million, one hundred two thousand, two hundred ten".