11021261021 has 4 divisors (see below), whose sum is σ = 11021747292. Its totient is φ = 11020774752.

The previous prime is 11021260981. The next prime is 11021261033. The reversal of 11021261021 is 12016212011.

11021261021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4666939225 + 6354321796 = 68315^2 + 79714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021261021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021261051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207386 + ... + 255051.

It is an arithmetic number, because the mean of its divisors is an integer number (2755436823).

Almost surely, 2^11021261021 is an apocalyptic number.

It is an amenable number.

11021261021 is a deficient number, since it is larger than the sum of its proper divisors (486271).

11021261021 is an equidigital number, since it uses as much as digits as its factorization.

11021261021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486270.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 11021261021 its reverse (12016212011), we get a palindrome (23037473032).

The spelling of 11021261021 in words is "eleven billion, twenty-one million, two hundred sixty-one thousand, twenty-one".