21212011102200 has 48 divisors (see below), whose sum is σ = 65757234418680. Its totient is φ = 5656536293760.

The previous prime is 21212011102199. The next prime is 21212011102349. The reversal of 21212011102200 is 220111021212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21212011102200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17676675319 + ... + 17676676518.

Almost surely, 2^{21212011102200} is an apocalyptic number.

21212011102200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212011102200 is an abundant number, since it is smaller than the sum of its proper divisors (44545223316480).

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

21212011102200 is a wasteful number, since it uses less digits than its factorization.

21212011102200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35353351856 (or 35353351847 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212011102200 its reverse (220111021212), we get a palindrome (21432122123412).

The spelling of 21212011102200 in words is "twenty-one trillion, two hundred twelve billion, eleven million, one hundred two thousand, two hundred".