11201021221 has 8 divisors (see below), whose sum is σ = 12081291264. Its totient is φ = 10323415920.

The previous prime is 11201021213. The next prime is 11201021269. The reversal of 11201021221 is 12212010211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11201021221 - 2³ = 11201021213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11201021291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657445 + ... + 674266.

It is an arithmetic number, because the mean of its divisors is an integer number (1510161408).

Almost surely, 2^11201021221 is an apocalyptic number.

It is an amenable number.

11201021221 is a deficient number, since it is larger than the sum of its proper divisors (880270043).

11201021221 is a wasteful number, since it uses less digits than its factorization.

11201021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332371.

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

Adding to 11201021221 its reverse (12212010211), we get a palindrome (23413031432).

The spelling of 11201021221 in words is "eleven billion, two hundred one million, twenty-one thousand, two hundred twenty-one".