21011110200 has 72 divisors (see below), whose sum is σ = 70562317800. Its totient is φ = 5602962240.

The previous prime is 21011110181. The next prime is 21011110201. The reversal of 21011110200 is 201111012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

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 (21011110201) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5834620 + ... + 5838219.

Almost surely, 2^21011110200 is an apocalyptic number.

21011110200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011110200 is an abundant number, since it is smaller than the sum of its proper divisors (49551207600).

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

21011110200 is a wasteful number, since it uses less digits than its factorization.

21011110200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11672861 (or 11672849 counting only the distinct ones).

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

Adding to 21011110200 its reverse (201111012), we get a palindrome (21212221212).

The spelling of 21011110200 in words is "twenty-one billion, eleven million, one hundred ten thousand, two hundred".