11011011521 has 4 divisors (see below), whose sum is σ = 11012286000. Its totient is φ = 11009737044.

The previous prime is 11011011497. The next prime is 11011011541. The reversal of 11011011521 is 12511011011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011011521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11011011496 and 11011011505.

It is not an unprimeable number, because it can be changed into a prime (11011011541) 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, 624191 + ... + 641588.

It is an arithmetic number, because the mean of its divisors is an integer number (2753071500).

Almost surely, 2^11011011521 is an apocalyptic number.

It is an amenable number.

11011011521 is a deficient number, since it is larger than the sum of its proper divisors (1274479).

11011011521 is an equidigital number, since it uses as much as digits as its factorization.

11011011521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274478.

The product of its (nonzero) digits is 10, while the sum is 14.

Adding to 11011011521 its reverse (12511011011), we get a palindrome (23522022532).

The spelling of 11011011521 in words is "eleven billion, eleven million, eleven thousand, five hundred twenty-one".