21577727018128 has 20 divisors (see below), whose sum is σ = 41807371768560. Its totient is φ = 10788727852064.

The previous prime is 21577727018117. The next prime is 21577727018171. The reversal of 21577727018128 is 82181072777512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7160098 + ... + 9717121.

It is an arithmetic number, because the mean of its divisors is an integer number (2090368588428).

Almost surely, 2^{21577727018128} is an apocalyptic number.

It is an amenable number.

21577727018128 is a deficient number, since it is larger than the sum of its proper divisors (20229644750432).

21577727018128 is a wasteful number, since it uses less digits than its factorization.

21577727018128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16957134 (or 16957128 counting only the distinct ones).

The product of its (nonzero) digits is 6146560, while the sum is 58.

The spelling of 21577727018128 in words is "twenty-one trillion, five hundred seventy-seven billion, seven hundred twenty-seven million, eighteen thousand, one hundred twenty-eight".