21212100202200 has 48 divisors (see below), whose sum is σ = 65757510628680. Its totient is φ = 5656560053760.

The previous prime is 21212100202171. The next prime is 21212100202211. The reversal of 21212100202200 is 220200121212.

It is a super-3 number, since 3×21212100202200³ (a number of 41 digits) contains 333 as substring.

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 21212100202200.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17676749569 + ... + 17676750768.

Almost surely, 2^{21212100202200} is an apocalyptic number.

21212100202200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212100202200 is an abundant number, since it is smaller than the sum of its proper divisors (44545410426480).

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

21212100202200 is a wasteful number, since it uses less digits than its factorization.

21212100202200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35353500356 (or 35353500347 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21212100202200 its reverse (220200121212), we get a palindrome (21432300323412).

The spelling of 21212100202200 in words is "twenty-one trillion, two hundred twelve billion, one hundred million, two hundred two thousand, two hundred".