11020121021 has 24 divisors (see below), whose sum is σ = 14617524600. Its totient is φ = 8206313472.

The previous prime is 11020120997. The next prime is 11020121023. The reversal of 11020121021 is 12012102011.

It can be written as a sum of positive squares in 4 ways, for example, as 4338856900 + 6681264121 = 65870^2 + 81739^2 .

It is not a de Polignac number, because 11020121021 - 2²² = 11015926717 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11020120993 and 11020121011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11020121023) 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 23 ways as a sum of consecutive naturals, for example, 497996 + ... + 519653.

It is an arithmetic number, because the mean of its divisors is an integer number (609063525).

Almost surely, 2^11020121021 is an apocalyptic number.

It is an amenable number.

11020121021 is a deficient number, since it is larger than the sum of its proper divisors (3597403579).

11020121021 is a wasteful number, since it uses less digits than its factorization.

11020121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017693 (or 1017686 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11020121021 its reverse (12012102011), we get a palindrome (23032223032).

The spelling of 11020121021 in words is "eleven billion, twenty million, one hundred twenty-one thousand, twenty-one".