11101021221 has 8 divisors (see below), whose sum is σ = 14802021504. Its totient is φ = 7400350880.

The previous prime is 11101021213. The next prime is 11101021241. The reversal of 11101021221 is 12212010111.

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 11101021221 - 2³ = 11101021213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11101021197 and 11101021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101021241) 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, 11236 + ... + 149426.

It is an arithmetic number, because the mean of its divisors is an integer number (1850252688).

Almost surely, 2^11101021221 is an apocalyptic number.

It is an amenable number.

11101021221 is a deficient number, since it is larger than the sum of its proper divisors (3701000283).

11101021221 is a wasteful number, since it uses less digits than its factorization.

11101021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164971.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 11101021221 its reverse (12212010111), we get a palindrome (23313031332).

It can be divided in two parts, 111010 and 21221, that added together give a palindrome (132231).

The spelling of 11101021221 in words is "eleven billion, one hundred one million, twenty-one thousand, two hundred twenty-one".