21120311200 has 72 divisors (see below), whose sum is σ = 53801743968. Its totient is φ = 8080807680.

The previous prime is 21120311171. The next prime is 21120311203. The reversal of 21120311200 is 211302112.

It is not an unprimeable number, because it can be changed into a prime (21120311203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 555522 + ... + 592321.

It is an arithmetic number, because the mean of its divisors is an integer number (747246444).

Almost surely, 2^21120311200 is an apocalyptic number.

21120311200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120311200 is an abundant number, since it is smaller than the sum of its proper divisors (32681432768).

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

21120311200 is a wasteful number, since it uses less digits than its factorization.

21120311200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147886 (or 1147873 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21120311200 its reverse (211302112), we get a palindrome (21331613312).

The spelling of 21120311200 in words is "twenty-one billion, one hundred twenty million, three hundred eleven thousand, two hundred".