21221202002200 has 48 divisors (see below), whose sum is σ = 49818316981680. Its totient is φ = 8406068357760.

The previous prime is 21221202002197. The next prime is 21221202002201. The reversal of 21221202002200 is 220020212212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221202002201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 515057119 + ... + 515098318.

It is an arithmetic number, because the mean of its divisors is an integer number (1037881603785).

Almost surely, 2^{21221202002200} is an apocalyptic number.

21221202002200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221202002200 is an abundant number, since it is smaller than the sum of its proper divisors (28597114979480).

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

21221202002200 is a wasteful number, since it uses less digits than its factorization.

21221202002200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030155556 (or 1030155547 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21221202002200 its reverse (220020212212), we get a palindrome (21441222214412).

The spelling of 21221202002200 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, two thousand, two hundred".