11021544221 has 4 divisors (see below), whose sum is σ = 11401597500. Its totient is φ = 10641490944.

The previous prime is 11021544211. The next prime is 11021544253. The reversal of 11021544221 is 12244512011.

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 2864925625 + 8156618596 = 53525^2 + 90314^2 .

It is a cyclic number.

It is not a de Polignac number, because 11021544221 - 2²⁶ = 10954435357 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 (11021544211) 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, 190026596 + ... + 190026653.

It is an arithmetic number, because the mean of its divisors is an integer number (2850399375).

Almost surely, 2^11021544221 is an apocalyptic number.

It is an amenable number.

11021544221 is a deficient number, since it is larger than the sum of its proper divisors (380053279).

11021544221 is an equidigital number, since it uses as much as digits as its factorization.

11021544221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380053278.

The product of its (nonzero) digits is 640, while the sum is 23.

The spelling of 11021544221 in words is "eleven billion, twenty-one million, five hundred forty-four thousand, two hundred twenty-one".