21222211222200 has 96 divisors (see below), whose sum is σ = 66230391006000. Its totient is φ = 5621274716160.

The previous prime is 21222211222171. The next prime is 21222211222253. The reversal of 21222211222200 is 222211222212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118603057 + ... + 118781856.

Almost surely, 2^{21222211222200} is an apocalyptic number.

21222211222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222211222200 is an abundant number, since it is smaller than the sum of its proper divisors (45008179783800).

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

21222211222200 is a wasteful number, since it uses less digits than its factorization.

21222211222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237385081 (or 237385072 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21222211222200 its reverse (222211222212), we get a palindrome (21444422444412).

The spelling of 21222211222200 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred eleven million, two hundred twenty-two thousand, two hundred".