11201212221 has 16 divisors (see below), whose sum is σ = 15599224320. Its totient is φ = 7135959600.

The previous prime is 11201212193. The next prime is 11201212223. The reversal of 11201212221 is 12221210211.

It is not a de Polignac number, because 11201212221 - 2⁵ = 11201212189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11201212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11201212223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4711 + ... + 149748.

It is an arithmetic number, because the mean of its divisors is an integer number (974951520).

Almost surely, 2^11201212221 is an apocalyptic number.

It is an amenable number.

11201212221 is a deficient number, since it is larger than the sum of its proper divisors (4398012099).

11201212221 is a wasteful number, since it uses less digits than its factorization.

11201212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155536.

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

Adding to 11201212221 its reverse (12221210211), we get a palindrome (23422422432).

The spelling of 11201212221 in words is "eleven billion, two hundred one million, two hundred twelve thousand, two hundred twenty-one".