11202101221 has 4 divisors (see below), whose sum is σ = 11475323244. Its totient is φ = 10928879200.

The previous prime is 11202101177. The next prime is 11202101233. The reversal of 11202101221 is 12210120211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12210120211 = 107 ⋅114113273.

It can be written as a sum of positive squares in 2 ways, for example, as 6066228996 + 5135872225 = 77886^2 + 71665^2 .

It is a cyclic number.

It is not a de Polignac number, because 11202101221 - 2¹⁹ = 11201576933 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 (11202101621) 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, 136610950 + ... + 136611031.

It is an arithmetic number, because the mean of its divisors is an integer number (2868830811).

Almost surely, 2^11202101221 is an apocalyptic number.

It is an amenable number.

11202101221 is a deficient number, since it is larger than the sum of its proper divisors (273222023).

11202101221 is an equidigital number, since it uses as much as digits as its factorization.

11202101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273222022.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11202101221 its reverse (12210120211), we get a palindrome (23412221432).

The spelling of 11202101221 in words is "eleven billion, two hundred two million, one hundred one thousand, two hundred twenty-one".