21528241678233 has 8 divisors (see below), whose sum is σ = 31893691375200. Its totient is φ = 14352161118804.

The previous prime is 21528241678211. The next prime is 21528241678247. The reversal of 21528241678233 is 33287614282512.

21528241678233 is a `hidden beast` number, since 2 + 1 + 52 + 82 + 416 + 78 + 2 + 33 = 666.

It is not a de Polignac number, because 21528241678233 - 2⁶ = 21528241678169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21528241678233.

It is not an unprimeable number, because it can be changed into a prime (21528241678033) 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, 398671142163 + ... + 398671142216.

It is an arithmetic number, because the mean of its divisors is an integer number (3986711421900).

Almost surely, 2^{21528241678233} is an apocalyptic number.

It is an amenable number.

21528241678233 is a deficient number, since it is larger than the sum of its proper divisors (10365449696967).

21528241678233 is an equidigital number, since it uses as much as digits as its factorization.

21528241678233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797342284388 (or 797342284382 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 21528241678233 in words is "twenty-one trillion, five hundred twenty-eight billion, two hundred forty-one million, six hundred seventy-eight thousand, two hundred thirty-three".