11001220221 has 8 divisors (see below), whose sum is σ = 14671677664. Its totient is φ = 7332454800.

The previous prime is 11001220159. The next prime is 11001220247. The reversal of 11001220221 is 12202210011.

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

It is not a de Polignac number, because 11001220221 - 2¹⁵ = 11001187453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11001220197 and 11001220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001220271) 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, 407755 + ... + 433896.

It is an arithmetic number, because the mean of its divisors is an integer number (1833959708).

Almost surely, 2^11001220221 is an apocalyptic number.

It is an amenable number.

11001220221 is a deficient number, since it is larger than the sum of its proper divisors (3670457443).

11001220221 is an equidigital number, since it uses as much as digits as its factorization.

11001220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846011.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 11001220221 its reverse (12202210011), we get a palindrome (23203430232).

The spelling of 11001220221 in words is "eleven billion, one million, two hundred twenty thousand, two hundred twenty-one".