221000210221212 has 108 divisors (see below), whose sum is σ = 581205284817976. Its totient is φ = 73525877992800.

The previous prime is 221000210221207. The next prime is 221000210221247. The reversal of 221000210221212 is 212122012000122.

It is a happy number.

221000210221212 is a `hidden beast` number, since 2 + 21 + 0 + 0 + 0 + 210 + 221 + 212 = 666.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5674962 + ... + 21776262.

Almost surely, 2^{221000210221212} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221000210221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290602642408988).

221000210221212 is an abundant number, since it is smaller than the sum of its proper divisors (360205074596764).

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

221000210221212 is an equidigital number, since it uses as much as digits as its factorization.

221000210221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16101852 (or 16101829 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221000210221212 its reverse (212122012000122), we get a palindrome (433122222221334).

The spelling of 221000210221212 in words is "two hundred twenty-one trillion, two hundred ten million, two hundred twenty-one thousand, two hundred twelve".