11020021021 has 4 divisors (see below), whose sum is σ = 11075960412. Its totient is φ = 10964081632.

The previous prime is 11020020953. The next prime is 11020021031. The reversal of 11020021021 is 12012002011.

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 10730680921 + 289340100 = 103589^2 + 17010^2 .

It is a cyclic number.

It is not a de Polignac number, because 11020021021 - 2⁹ = 11020020509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11020020989 and 11020021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11020021031) 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, 27969400 + ... + 27969793.

It is an arithmetic number, because the mean of its divisors is an integer number (2768990103).

Almost surely, 2^11020021021 is an apocalyptic number.

It is an amenable number.

11020021021 is a deficient number, since it is larger than the sum of its proper divisors (55939391).

11020021021 is an equidigital number, since it uses as much as digits as its factorization.

11020021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55939390.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 11020021021 its reverse (12012002011), we get a palindrome (23032023032).

The spelling of 11020021021 in words is "eleven billion, twenty million, twenty-one thousand, twenty-one".