21212221101200 has 60 divisors (see below), whose sum is σ = 51072431536128. Its totient is φ = 8466562473600.

The previous prime is 21212221101193. The next prime is 21212221101209. The reversal of 21212221101200 is 210112221212.

It is not an unprimeable number, because it can be changed into a prime (21212221101209) 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, 57083216 + ... + 57453615.

Almost surely, 2^{21212221101200} is an apocalyptic number.

21212221101200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212221101200 is an abundant number, since it is smaller than the sum of its proper divisors (29860210434928).

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

21212221101200 is a wasteful number, since it uses less digits than its factorization.

21212221101200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114537312 (or 114537301 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212221101200 its reverse (210112221212), we get a palindrome (21422333322412).

The spelling of 21212221101200 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, one hundred one thousand, two hundred".