21728450600 has 24 divisors (see below), whose sum is σ = 50518648110. Its totient is φ = 8691380160.

The previous prime is 21728450587. The next prime is 21728450609. The reversal of 21728450600 is 605482712.

It can be written as a sum of positive squares in 3 ways, for example, as 20759622724 + 968827876 = 144082^2 + 31126^2 .

It is not an unprimeable number, because it can be changed into a prime (21728450609) 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, 54320927 + ... + 54321326.

Almost surely, 2^21728450600 is an apocalyptic number.

21728450600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21728450600 is an abundant number, since it is smaller than the sum of its proper divisors (28790197510).

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

21728450600 is a wasteful number, since it uses less digits than its factorization.

21728450600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108642269 (or 108642260 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 21728450600 in words is "twenty-one billion, seven hundred twenty-eight million, four hundred fifty thousand, six hundred".