21022201222200 has 288 divisors, whose sum is σ = 72570268040400. Its totient is φ = 5449698938880.

The previous prime is 21022201222171. The next prime is 21022201222223. The reversal of 21022201222200 is 222210222012.

21022201222200 is a `hidden beast` number, since 2 + 102 + 220 + 122 + 220 + 0 = 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 71 ways as a sum of consecutive naturals, for example, 77320096 + ... + 77591504.

Almost surely, 2^{21022201222200} is an apocalyptic number.

21022201222200 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 21022201222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36285134020200).

21022201222200 is an abundant number, since it is smaller than the sum of its proper divisors (51548066818200).

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

21022201222200 is a wasteful number, since it uses less digits than its factorization.

21022201222200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272631 (or 272619 counting only the distinct ones).

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

Adding to 21022201222200 its reverse (222210222012), we get a palindrome (21244411444212).

The spelling of 21022201222200 in words is "twenty-one trillion, twenty-two billion, two hundred one million, two hundred twenty-two thousand, two hundred".