11201121221 has 4 divisors (see below), whose sum is σ = 11562447744. Its totient is φ = 10839794700.

The previous prime is 11201121203. The next prime is 11201121251. The reversal of 11201121221 is 12212110211.

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 11201121221 - 2¹⁰ = 11201120197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11201121196 and 11201121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11201121251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180663215 + ... + 180663276.

It is an arithmetic number, because the mean of its divisors is an integer number (2890611936).

Almost surely, 2^11201121221 is an apocalyptic number.

It is an amenable number.

11201121221 is a deficient number, since it is larger than the sum of its proper divisors (361326523).

11201121221 is an equidigital number, since it uses as much as digits as its factorization.

11201121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361326522.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11201121221 its reverse (12212110211), we get a palindrome (23413231432).

The spelling of 11201121221 in words is "eleven billion, two hundred one million, one hundred twenty-one thousand, two hundred twenty-one".