21120010200 has 192 divisors, whose sum is σ = 74521792800. Its totient is φ = 5494579200.

The previous prime is 21120010187. The next prime is 21120010201. The reversal of 21120010200 is 201002112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120010201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 173704 + ... + 269096.

Almost surely, 2^21120010200 is an apocalyptic number.

21120010200 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 21120010200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37260896400).

21120010200 is an abundant number, since it is smaller than the sum of its proper divisors (53401782600).

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

21120010200 is a wasteful number, since it uses less digits than its factorization.

21120010200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95459 (or 95444 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21120010200 its reverse (201002112), we get a palindrome (21321012312).

The spelling of 21120010200 in words is "twenty-one billion, one hundred twenty million, ten thousand, two hundred".