21131200200 has 96 divisors (see below), whose sum is σ = 71461899360. Its totient is φ = 5122713600.

The previous prime is 21131200199. The next prime is 21131200201. The reversal of 21131200200 is 200213112.

It is an interprime number because it is at equal distance from previous prime (21131200199) and next prime (21131200201).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21131200201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1594249 + ... + 1607448.

It is an arithmetic number, because the mean of its divisors is an integer number (744394785).

Almost surely, 2^21131200200 is an apocalyptic number.

21131200200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131200200 is an abundant number, since it is smaller than the sum of its proper divisors (50330699160).

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

21131200200 is a wasteful number, since it uses less digits than its factorization.

21131200200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3201727 (or 3201718 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21131200200 its reverse (200213112), we get a palindrome (21331413312).

The spelling of 21131200200 in words is "twenty-one billion, one hundred thirty-one million, two hundred thousand, two hundred".