11020511021 has 4 divisors (see below), whose sum is σ = 11868242652. Its totient is φ = 10172779392.

The previous prime is 11020510999. The next prime is 11020511027. The reversal of 11020511021 is 12011502011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12011502011 = 1433 ⋅8382067.

It can be written as a sum of positive squares in 2 ways, for example, as 5657145796 + 5363365225 = 75214^2 + 73235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11020511021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11020510987 and 11020511005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11020511027) 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, 423865796 + ... + 423865821.

It is an arithmetic number, because the mean of its divisors is an integer number (2967060663).

Almost surely, 2^11020511021 is an apocalyptic number.

It is an amenable number.

11020511021 is a deficient number, since it is larger than the sum of its proper divisors (847731631).

11020511021 is an equidigital number, since it uses as much as digits as its factorization.

11020511021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847731630.

The product of its (nonzero) digits is 20, while the sum is 14.

The spelling of 11020511021 in words is "eleven billion, twenty million, five hundred eleven thousand, twenty-one".