21201202222200 has 2304 divisors, whose sum is σ = 97045288704000. Its totient is φ = 4005564825600.

The previous prime is 21201202222169. The next prime is 21201202222243. The reversal of 21201202222200 is 222220210212.

21201202222200 is a `hidden beast` number, since 2 + 1 + 201 + 20 + 222 + 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 575 ways as a sum of consecutive naturals, for example, 42149507149 + ... + 42149507651.

It is an arithmetic number, because the mean of its divisors is an integer number (42120351000).

Almost surely, 2^{21201202222200} is an apocalyptic number.

21201202222200 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 21201202222200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48522644352000).

21201202222200 is an abundant number, since it is smaller than the sum of its proper divisors (75844086481800).

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

21201202222200 is a wasteful number, since it uses less digits than its factorization.

21201202222200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 850 counting only the distinct ones).

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

Adding to 21201202222200 its reverse (222220210212), we get a palindrome (21423422432412).

The spelling of 21201202222200 in words is "twenty-one trillion, two hundred one billion, two hundred two million, two hundred twenty-two thousand, two hundred".