11202121221 has 16 divisors (see below), whose sum is σ = 15696588864. Its totient is φ = 7097255424.

The previous prime is 11202121211. The next prime is 11202121223. The reversal of 11202121221 is 12212120211.

11202121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11202121221 - 2⁷ = 11202121093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11202121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11202121223) 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 15 ways as a sum of consecutive naturals, for example, 1168716 + ... + 1178261.

It is an arithmetic number, because the mean of its divisors is an integer number (981036804).

Almost surely, 2^11202121221 is an apocalyptic number.

It is an amenable number.

11202121221 is a deficient number, since it is larger than the sum of its proper divisors (4494467643).

11202121221 is a wasteful number, since it uses less digits than its factorization.

11202121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347060.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 11202121221 its reverse (12212120211), we get a palindrome (23414241432).

The spelling of 11202121221 in words is "eleven billion, two hundred two million, one hundred twenty-one thousand, two hundred twenty-one".