21111000010200 has 288 divisors, whose sum is σ = 71307301665600. Its totient is φ = 5597121761280.

The previous prime is 21111000010169. The next prime is 21111000010267. The reversal of 21111000010200 is 201000011112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 527979409 + ... + 528019391.

It is an arithmetic number, because the mean of its divisors is an integer number (247594797450).

Almost surely, 2^{21111000010200} is an apocalyptic number.

21111000010200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111000010200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35653650832800).

21111000010200 is an abundant number, since it is smaller than the sum of its proper divisors (50196301655400).

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

21111000010200 is a wasteful number, since it uses less digits than its factorization.

21111000010200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41691 (or 41679 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21111000010200 its reverse (201000011112), we get a palindrome (21312000021312).

The spelling of 21111000010200 in words is "twenty-one trillion, one hundred eleven billion, ten thousand, two hundred".