20235021533 has 4 divisors (see below), whose sum is σ = 20235309180. Its totient is φ = 20234733888.

The previous prime is 20235021523. The next prime is 20235021539. The reversal of 20235021533 is 33512053202.

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: 33512053202 = 2 ⋅16756026601.

It can be written as a sum of positive squares in 2 ways, for example, as 10638272164 + 9596749369 = 103142^2 + 97963^2 .

It is a cyclic number.

It is not a de Polignac number, because 20235021533 - 2⁴ = 20235021517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20235021539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40091 + ... + 205127.

It is an arithmetic number, because the mean of its divisors is an integer number (5058827295).

Almost surely, 2^20235021533 is an apocalyptic number.

It is an amenable number.

20235021533 is a deficient number, since it is larger than the sum of its proper divisors (287647).

20235021533 is a wasteful number, since it uses less digits than its factorization.

20235021533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287646.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 20235021533 its reverse (33512053202), we get a palindrome (53747074735).

The spelling of 20235021533 in words is "twenty billion, two hundred thirty-five million, twenty-one thousand, five hundred thirty-three".