21043441200 has 60 divisors (see below), whose sum is σ = 67409160488. Its totient is φ = 5611584000.

The previous prime is 21043441189. The next prime is 21043441217. The reversal of 21043441200 is 214434012.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8766901 + ... + 8769300.

Almost surely, 2^21043441200 is an apocalyptic number.

21043441200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21043441200 is an abundant number, since it is smaller than the sum of its proper divisors (46365719288).

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

21043441200 is a wasteful number, since it uses less digits than its factorization.

21043441200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17536222 (or 17536211 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21043441200 its reverse (214434012), we get a palindrome (21257875212).

The spelling of 21043441200 in words is "twenty-one billion, forty-three million, four hundred forty-one thousand, two hundred".