11021020221221 has 4 divisors (see below), whose sum is σ = 11500195013472. Its totient is φ = 10541845428972.

The previous prime is 11021020221161. The next prime is 11021020221229. The reversal of 11021020221221 is 12212202012011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11021020221221 - 2⁶ = 11021020221157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11021020221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11021020221229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239587396091 + ... + 239587396136.

It is an arithmetic number, because the mean of its divisors is an integer number (2875048753368).

Almost surely, 2^{11021020221221} is an apocalyptic number.

It is an amenable number.

11021020221221 is a deficient number, since it is larger than the sum of its proper divisors (479174792251).

11021020221221 is an equidigital number, since it uses as much as digits as its factorization.

11021020221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479174792250.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11021020221221 its reverse (12212202012011), we get a palindrome (23233222233232).

The spelling of 11021020221221 in words is "eleven trillion, twenty-one billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".