11020205521 has 4 divisors (see below), whose sum is σ = 11867913652. Its totient is φ = 10172497392.

The previous prime is 11020205513. The next prime is 11020205543. The reversal of 11020205521 is 12550202011.

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 567392400 + 10452813121 = 23820^2 + 102239^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020205521 - 2³ = 11020205513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11020205591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423854046 + ... + 423854071.

It is an arithmetic number, because the mean of its divisors is an integer number (2966978413).

Almost surely, 2^11020205521 is an apocalyptic number.

It is an amenable number.

11020205521 is a deficient number, since it is larger than the sum of its proper divisors (847708131).

11020205521 is an equidigital number, since it uses as much as digits as its factorization.

11020205521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847708130.

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 11020205521 its reverse (12550202011), we get a palindrome (23570407532).

The spelling of 11020205521 in words is "eleven billion, twenty million, two hundred five thousand, five hundred twenty-one".