11221121221021 has 4 divisors (see below), whose sum is σ = 11583092873344. Its totient is φ = 10859149568700.

The previous prime is 11221121221001. The next prime is 11221121221027. The reversal of 11221121221021 is 12012212112211.

It is a happy number.

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 11221121221021 - 2³⁵ = 11186761482653 is a prime.

It is a super-3 number, since 3×11221121221021³ (a number of 40 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 11221121221021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221121221027) 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, 180985826115 + ... + 180985826176.

It is an arithmetic number, because the mean of its divisors is an integer number (2895773218336).

Almost surely, 2^{11221121221021} is an apocalyptic number.

It is an amenable number.

11221121221021 is a deficient number, since it is larger than the sum of its proper divisors (361971652323).

11221121221021 is an equidigital number, since it uses as much as digits as its factorization.

11221121221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361971652322.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11221121221021 its reverse (12012212112211), we get a palindrome (23233333333232).

The spelling of 11221121221021 in words is "eleven trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty-one".