28533336521 has 2 divisors, whose sum is σ = 28533336522. Its totient is φ = 28533336520.

The previous prime is 28533336511. The next prime is 28533336577. The reversal of 28533336521 is 12563333582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20313375625 + 8219960896 = 142525^2 + 90664^2 .

It is a cyclic number.

It is not a de Polignac number, because 28533336521 - 2⁶ = 28533336457 is a prime.

It is not a weakly prime, because it can be changed into another prime (28533336511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14266668260 + 14266668261.

It is an arithmetic number, because the mean of its divisors is an integer number (14266668261).

Almost surely, 2^28533336521 is an apocalyptic number.

It is an amenable number.

28533336521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28533336521 is an equidigital number, since it uses as much as digits as its factorization.

28533336521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 41.

The spelling of 28533336521 in words is "twenty-eight billion, five hundred thirty-three million, three hundred thirty-six thousand, five hundred twenty-one".