21131103200 has 144 divisors (see below), whose sum is σ = 52590384000. Its totient is φ = 8289093120.

The previous prime is 21131103193. The next prime is 21131103271. The reversal of 21131103200 is 230113112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14096051 + ... + 14097549.

It is an arithmetic number, because the mean of its divisors is an integer number (365211000).

Almost surely, 2^21131103200 is an apocalyptic number.

21131103200 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 21131103200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26295192000).

21131103200 is an abundant number, since it is smaller than the sum of its proper divisors (31459280800).

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

21131103200 is a wasteful number, since it uses less digits than its factorization.

21131103200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849 (or 1836 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21131103200 its reverse (230113112), we get a palindrome (21361216312).

The spelling of 21131103200 in words is "twenty-one billion, one hundred thirty-one million, one hundred three thousand, two hundred".