21126316200 has 192 divisors, whose sum is σ = 71525332800. Its totient is φ = 5115801600.

The previous prime is 21126316181. The next prime is 21126316213. The reversal of 21126316200 is 261362112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11278464 + ... + 11280336.

It is an arithmetic number, because the mean of its divisors is an integer number (372527775).

Almost surely, 2^21126316200 is an apocalyptic number.

21126316200 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 21126316200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35762666400).

21126316200 is an abundant number, since it is smaller than the sum of its proper divisors (50399016600).

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

21126316200 is a wasteful number, since it uses less digits than its factorization.

21126316200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612 (or 3603 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21126316200 its reverse (261362112), we get a palindrome (21387678312).

The spelling of 21126316200 in words is "twenty-one billion, one hundred twenty-six million, three hundred sixteen thousand, two hundred".