21144105540200 has 24 divisors (see below), whose sum is σ = 49160045381430. Its totient is φ = 8457642216000.

The previous prime is 21144105540169. The next prime is 21144105540221. The reversal of 21144105540200 is 204550144112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20152611375556 + 991494164644 = 4489166^2 + 995738^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52860263651 + ... + 52860264050.

Almost surely, 2^{21144105540200} is an apocalyptic number.

21144105540200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21144105540200 is an abundant number, since it is smaller than the sum of its proper divisors (28015939841230).

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

21144105540200 is a wasteful number, since it uses less digits than its factorization.

21144105540200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105720527717 (or 105720527708 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 21144105540200 its reverse (204550144112), we get a palindrome (21348655684312).

The spelling of 21144105540200 in words is "twenty-one trillion, one hundred forty-four billion, one hundred five million, five hundred forty thousand, two hundred".