210221211222 has 96 divisors (see below), whose sum is σ = 514774925280. Its totient is φ = 63543744000.

The previous prime is 210221211181. The next prime is 210221211227. The reversal of 210221211222 is 222112122012.

It is a happy number.

210221211222 is a `hidden beast` number, since 2 + 10 + 221 + 211 + 222 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 210221211195 and 210221211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221211227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2580018 + ... + 2660250.

It is an arithmetic number, because the mean of its divisors is an integer number (5362238805).

Almost surely, 2^210221211222 is an apocalyptic number.

210221211222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 210221211222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257387462640).

210221211222 is an abundant number, since it is smaller than the sum of its proper divisors (304553714058).

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

210221211222 is a wasteful number, since it uses less digits than its factorization.

210221211222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80667 (or 80650 counting only the distinct ones).

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

Adding to 210221211222 its reverse (222112122012), we get a palindrome (432333333234).

The spelling of 210221211222 in words is "two hundred ten billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".