21212311012200 has 384 divisors, whose sum is σ = 91093562496000. Its totient is φ = 4407752851200.

The previous prime is 21212311012187. The next prime is 21212311012237. The reversal of 21212311012200 is 221011321212.

21212311012200 is a `hidden beast` number, since 21 + 212 + 311 + 0 + 122 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25092030 + ... + 25923629.

It is an arithmetic number, because the mean of its divisors is an integer number (237222819000).

Almost surely, 2^{21212311012200} is an apocalyptic number.

21212311012200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212311012200 is an abundant number, since it is smaller than the sum of its proper divisors (69881251483800).

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

21212311012200 is a wasteful number, since it uses less digits than its factorization.

21212311012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51015702 (or 51015687 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21212311012200 its reverse (221011321212), we get a palindrome (21433322333412).

The spelling of 21212311012200 in words is "twenty-one trillion, two hundred twelve billion, three hundred eleven million, twelve thousand, two hundred".