21220021222200 has 144 divisors (see below), whose sum is σ = 71265239926920. Its totient is φ = 5658566296320.

The previous prime is 21220021222187. The next prime is 21220021222217. The reversal of 21220021222200 is 222212002212.

21220021222200 is a `hidden beast` number, since 2 + 1 + 220 + 0 + 21 + 222 + 200 = 666.

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, 162300054 + ... + 162430746.

Almost surely, 2^{21220021222200} is an apocalyptic number.

21220021222200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220021222200 is an abundant number, since it is smaller than the sum of its proper divisors (50045218704720).

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

21220021222200 is a wasteful number, since it uses less digits than its factorization.

21220021222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220918 (or 220906 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21220021222200 its reverse (222212002212), we get a palindrome (21442233224412).

The spelling of 21220021222200 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, two hundred twenty-two thousand, two hundred".