21201144200 has 24 divisors (see below), whose sum is σ = 49292660730. Its totient is φ = 8480457600.

The previous prime is 21201144191. The next prime is 21201144203. The reversal of 21201144200 is 244110212.

It can be written as a sum of positive squares in 3 ways, for example, as 8379205444 + 12821938756 = 91538^2 + 113234^2 .

It is not an unprimeable number, because it can be changed into a prime (21201144203) 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, 53002661 + ... + 53003060.

Almost surely, 2^21201144200 is an apocalyptic number.

21201144200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201144200 is an abundant number, since it is smaller than the sum of its proper divisors (28091516530).

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

21201144200 is a wasteful number, since it uses less digits than its factorization.

21201144200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106005737 (or 106005728 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21201144200 its reverse (244110212), we get a palindrome (21445254412).

The spelling of 21201144200 in words is "twenty-one billion, two hundred one million, one hundred forty-four thousand, two hundred".