21313211200 has 42 divisors (see below), whose sum is σ = 52443824246. Its totient is φ = 8525283840.

The previous prime is 21313211159. The next prime is 21313211203. The reversal of 21313211200 is 211231312.

It can be written as a sum of positive squares in 3 ways, for example, as 2408061184 + 18905150016 = 49072^2 + 137496^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313211203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6658779 + ... + 6661978.

Almost surely, 2^21313211200 is an apocalyptic number.

21313211200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313211200 is an abundant number, since it is smaller than the sum of its proper divisors (31130613046).

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

21313211200 is a wasteful number, since it uses less digits than its factorization.

21313211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13320779 (or 13320764 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21313211200 its reverse (211231312), we get a palindrome (21524442512).

The spelling of 21313211200 in words is "twenty-one billion, three hundred thirteen million, two hundred eleven thousand, two hundred".