21013301200 has 60 divisors (see below), whose sum is σ = 50501960748. Its totient is φ = 8402406400.

The previous prime is 21013301191. The next prime is 21013301207. The reversal of 21013301200 is 210331012.

It can be written as a sum of positive squares in 6 ways, for example, as 7135518784 + 13877782416 = 84472^2 + 117804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013301207) 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, 1429890 + ... + 1444510.

Almost surely, 2^21013301200 is an apocalyptic number.

21013301200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013301200 is an abundant number, since it is smaller than the sum of its proper divisors (29488659548).

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

21013301200 is a wasteful number, since it uses less digits than its factorization.

21013301200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18232 (or 18221 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21013301200 its reverse (210331012), we get a palindrome (21223632212).

The spelling of 21013301200 in words is "twenty-one billion, thirteen million, three hundred one thousand, two hundred".