21222210112200 has 288 divisors, whose sum is σ = 72098655468840. Its totient is φ = 5593746432000.

The previous prime is 21222210112177. The next prime is 21222210112231. The reversal of 21222210112200 is 221101222212.

It is a happy number.

21222210112200 is a `hidden beast` number, since 2 + 1 + 222 + 210 + 11 + 220 + 0 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 8402960273796 + 12819249838404 = 2898786^2 + 3580398^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 107708974 + ... + 107905826.

Almost surely, 2^{21222210112200} is an apocalyptic number.

21222210112200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222210112200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36049327734420).

21222210112200 is an abundant number, since it is smaller than the sum of its proper divisors (50876445356640).

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

21222210112200 is a wasteful number, since it uses less digits than its factorization.

21222210112200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197569 (or 197557 counting only the distinct ones).

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

Adding to 21222210112200 its reverse (221101222212), we get a palindrome (21443311334412).

The spelling of 21222210112200 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, one hundred twelve thousand, two hundred".