21212220002200 has 24 divisors (see below), whose sum is σ = 49318411505580. Its totient is φ = 8484888000800.

The previous prime is 21212220002159. The next prime is 21212220002227. The reversal of 21212220002200 is 220002221212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53030549806 + ... + 53030550205.

Almost surely, 2^{21212220002200} is an apocalyptic number.

21212220002200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212220002200 is an abundant number, since it is smaller than the sum of its proper divisors (28106191503380).

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

21212220002200 is a wasteful number, since it uses less digits than its factorization.

21212220002200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106061100027 (or 106061100018 counting only the distinct ones).

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

Adding to 21212220002200 its reverse (220002221212), we get a palindrome (21432222223412).

The spelling of 21212220002200 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty million, two thousand, two hundred".