211221030210 has 64 divisors (see below), whose sum is σ = 516008275200. Its totient is φ = 55323371520.

The previous prime is 211221030203. The next prime is 211221030257. The reversal of 211221030210 is 12030122112.

It is a super-2 number, since 2×211221030210² (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 211221030210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327691 + ... + 727889.

It is an arithmetic number, because the mean of its divisors is an integer number (8062629300).

Almost surely, 2^211221030210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211221030210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258004137600).

211221030210 is an abundant number, since it is smaller than the sum of its proper divisors (304787244990).

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

211221030210 is a wasteful number, since it uses less digits than its factorization.

211221030210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400523.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 211221030210 its reverse (12030122112), we get a palindrome (223251152322).

The spelling of 211221030210 in words is "two hundred eleven billion, two hundred twenty-one million, thirty thousand, two hundred ten".