11100201221 has 4 divisors (see below), whose sum is σ = 11753154252. Its totient is φ = 10447248192.

The previous prime is 11100201209. The next prime is 11100201239. The reversal of 11100201221 is 12210200111.

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 3646468996 + 7453732225 = 60386^2 + 86335^2 .

It is a cyclic number.

It is not a de Polignac number, because 11100201221 - 2⁶ = 11100201157 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 (11100201241) 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, 326476490 + ... + 326476523.

It is an arithmetic number, because the mean of its divisors is an integer number (2938288563).

Almost surely, 2^11100201221 is an apocalyptic number.

It is an amenable number.

11100201221 is a deficient number, since it is larger than the sum of its proper divisors (652953031).

11100201221 is an equidigital number, since it uses as much as digits as its factorization.

11100201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652953030.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 11100201221 its reverse (12210200111), we get a palindrome (23310401332).

The spelling of 11100201221 in words is "eleven billion, one hundred million, two hundred one thousand, two hundred twenty-one".