20033288521 has 3 divisors (see below), whose sum is σ = 20033430061. Its totient is φ = 20033146982.

The previous prime is 20033288501. The next prime is 20033288531. The reversal of 20033288521 is 12588233002.

The square root of 20033288521 is 141539.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12588233002 = 2 ⋅6294116501.

It is a de Polignac number, because none of the positive numbers 2^k-20033288521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20033288501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70770 + ... + 212308.

Almost surely, 2^20033288521 is an apocalyptic number.

20033288521 is the 141539-th square number.

20033288521 is the 70770-th centered octagonal number.

It is an amenable number.

20033288521 is a deficient number, since it is larger than the sum of its proper divisors (141540).

20033288521 is an frugal number, since it uses more digits than its factorization.

20033288521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283078 (or 141539 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 20033288521 in words is "twenty billion, thirty-three million, two hundred eighty-eight thousand, five hundred twenty-one".