21827973128208 has 40 divisors (see below), whose sum is σ = 60726540627648. Its totient is φ = 6716299423872.

The previous prime is 21827973128207. The next prime is 21827973128267. The reversal of 21827973128208 is 80282137972812.

It is not an unprimeable number, because it can be changed into a prime (21827973128207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17490362460 + ... + 17490363707.

Almost surely, 2^{21827973128208} is an apocalyptic number.

It is an amenable number.

21827973128208 is an abundant number, since it is smaller than the sum of its proper divisors (38898567499440).

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

21827973128208 is a wasteful number, since it uses less digits than its factorization.

21827973128208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34980726191 (or 34980726185 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 60.

The spelling of 21827973128208 in words is "twenty-one trillion, eight hundred twenty-seven billion, nine hundred seventy-three million, one hundred twenty-eight thousand, two hundred eight".