20235530521 has 4 divisors (see below), whose sum is σ = 20421177700. Its totient is φ = 20049883344.

The previous prime is 20235530509. The next prime is 20235530527. The reversal of 20235530521 is 12503553202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12841422400 + 7394108121 = 113320^2 + 85989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20235530521 - 2¹⁷ = 20235399449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20235530521.

It is not an unprimeable number, because it can be changed into a prime (20235530527) 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, 92823426 + ... + 92823643.

It is an arithmetic number, because the mean of its divisors is an integer number (5105294425).

Almost surely, 2^20235530521 is an apocalyptic number.

It is an amenable number.

20235530521 is a deficient number, since it is larger than the sum of its proper divisors (185647179).

20235530521 is a wasteful number, since it uses less digits than its factorization.

20235530521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185647178.

The product of its (nonzero) digits is 9000, while the sum is 28.

The spelling of 20235530521 in words is "twenty billion, two hundred thirty-five million, five hundred thirty thousand, five hundred twenty-one".