11001001101221 has 12 divisors (see below), whose sum is σ = 11610935327232. Its totient is φ = 10421587698984.

The previous prime is 11001001101217. The next prime is 11001001101241. The reversal of 11001001101221 is 12210110010011.

It is not a de Polignac number, because 11001001101221 - 2² = 11001001101217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001001101241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8709020 + ... + 9891866.

It is an arithmetic number, because the mean of its divisors is an integer number (967577943936).

Almost surely, 2^{11001001101221} is an apocalyptic number.

It is an amenable number.

11001001101221 is a deficient number, since it is larger than the sum of its proper divisors (609934226011).

11001001101221 is a wasteful number, since it uses less digits than its factorization.

11001001101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1208648 (or 1208629 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11001001101221 its reverse (12210110010011), we get a palindrome (23211111111232).

The spelling of 11001001101221 in words is "eleven trillion, one billion, one million, one hundred one thousand, two hundred twenty-one".