21444503200 has 36 divisors (see below), whose sum is σ = 52351395390. Its totient is φ = 8577800960.

The previous prime is 21444503191. The next prime is 21444503207. The reversal of 21444503200 is 230544412.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 20635897104 + 808606096 = 143652^2 + 28436^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (21444503207) 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, 13402015 + ... + 13403614.

Almost surely, 2^21444503200 is an apocalyptic number.

21444503200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21444503200 is an abundant number, since it is smaller than the sum of its proper divisors (30906892190).

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

21444503200 is a wasteful number, since it uses less digits than its factorization.

21444503200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26805649 (or 26805636 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The spelling of 21444503200 in words is "twenty-one billion, four hundred forty-four million, five hundred three thousand, two hundred".