21131303200 has 72 divisors (see below), whose sum is σ = 58956351552. Its totient is φ = 7245016320.

The previous prime is 21131303191. The next prime is 21131303243. The reversal of 21131303200 is 230313112.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1881124 + ... + 1892323.

It is an arithmetic number, because the mean of its divisors is an integer number (818838216).

Almost surely, 2^21131303200 is an apocalyptic number.

21131303200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21131303200 is an abundant number, since it is smaller than the sum of its proper divisors (37825048352).

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

21131303200 is a wasteful number, since it uses less digits than its factorization.

21131303200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3773474 (or 3773461 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21131303200 its reverse (230313112), we get a palindrome (21361616312).

The spelling of 21131303200 in words is "twenty-one billion, one hundred thirty-one million, three hundred three thousand, two hundred".