21121210200222 has 96 divisors (see below), whose sum is σ = 50385312563040. Its totient is φ = 6341340960000.

The previous prime is 21121210200203. The next prime is 21121210200239. The reversal of 21121210200222 is 22200201212112.

It is a happy number.

21121210200222 is a `hidden beast` number, since 2 + 11 + 21 + 210 + 200 + 222 = 666.

It is a super-2 number, since 2×21121210200222² (a number of 27 digits) contains 22 as substring.

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 = 21121210200195 and 21121210200204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8544972 + ... + 10735872.

It is an arithmetic number, because the mean of its divisors is an integer number (524847005865).

Almost surely, 2^{21121210200222} is an apocalyptic number.

21121210200222 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 21121210200222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25192656281520).

21121210200222 is an abundant number, since it is smaller than the sum of its proper divisors (29264102362818).

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

21121210200222 is a wasteful number, since it uses less digits than its factorization.

21121210200222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191370 (or 2191367 counting only the distinct ones).

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

Adding to 21121210200222 its reverse (22200201212112), we get a palindrome (43321411412334).

The spelling of 21121210200222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred ten million, two hundred thousand, two hundred twenty-two".