21728053144 has 48 divisors (see below), whose sum is σ = 47433703680. Its totient is φ = 9303739200.

The previous prime is 21728053111. The next prime is 21728053153. The reversal of 21728053144 is 44135082712.

It is a congruent number.

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, 427114 + ... + 475270.

It is an arithmetic number, because the mean of its divisors is an integer number (988202160).

Almost surely, 2^21728053144 is an apocalyptic number.

It is an amenable number.

21728053144 is an abundant number, since it is smaller than the sum of its proper divisors (25705650536).

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

21728053144 is a wasteful number, since it uses less digits than its factorization.

21728053144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49328 (or 49317 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The spelling of 21728053144 in words is "twenty-one billion, seven hundred twenty-eight million, fifty-three thousand, one hundred forty-four".