11231201221 has 4 divisors (see below), whose sum is σ = 11443110732. Its totient is φ = 11019291712.

The previous prime is 11231201159. The next prime is 11231201273. The reversal of 11231201221 is 12210213211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8740193121 + 2491008100 = 93489^2 + 49910^2 .

It is a cyclic number.

It is not a de Polignac number, because 11231201221 - 2¹⁵ = 11231168453 is a prime.

It is a super-2 number, since 2×11231201221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11231201195 and 11231201204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231261221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105954676 + ... + 105954781.

It is an arithmetic number, because the mean of its divisors is an integer number (2860777683).

Almost surely, 2^11231201221 is an apocalyptic number.

It is an amenable number.

11231201221 is a deficient number, since it is larger than the sum of its proper divisors (211909511).

11231201221 is an equidigital number, since it uses as much as digits as its factorization.

11231201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211909510.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11231201221 its reverse (12210213211), we get a palindrome (23441414432).

The spelling of 11231201221 in words is "eleven billion, two hundred thirty-one million, two hundred one thousand, two hundred twenty-one".