21577271284 has 12 divisors (see below), whose sum is σ = 39981414564. Its totient is φ = 10154009984.

The previous prime is 21577271251. The next prime is 21577271323. The reversal of 21577271284 is 48217277512.

It can be written as a sum of positive squares in 2 ways, for example, as 12018298384 + 9558972900 = 109628^2 + 97770^2 .

It is a congruent number.

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, 158656339 + ... + 158656474.

It is an arithmetic number, because the mean of its divisors is an integer number (3331784547).

Almost surely, 2^21577271284 is an apocalyptic number.

It is an amenable number.

21577271284 is a deficient number, since it is larger than the sum of its proper divisors (18404143280).

21577271284 is a wasteful number, since it uses less digits than its factorization.

21577271284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317312834 (or 317312832 counting only the distinct ones).

The product of its digits is 439040, while the sum is 46.

The spelling of 21577271284 in words is "twenty-one billion, five hundred seventy-seven million, two hundred seventy-one thousand, two hundred eighty-four".