11100122221 has 6 divisors (see below), whose sum is σ = 11715087822. Its totient is φ = 10515904920.

The previous prime is 11100122203. The next prime is 11100122233. The reversal of 11100122221 is 12222100111.

It can be written as a sum of positive squares in only one way, i.e., 9046672996 + 2053449225 = 95114^2 + 45315^2 .

It is not a de Polignac number, because 11100122221 - 2¹⁵ = 11100089453 is a prime.

It is a super-2 number, since 2×11100122221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100122251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15373770 + ... + 15374491.

It is an arithmetic number, because the mean of its divisors is an integer number (1952514637).

Almost surely, 2^11100122221 is an apocalyptic number.

It is an amenable number.

11100122221 is a deficient number, since it is larger than the sum of its proper divisors (614965601).

11100122221 is an equidigital number, since it uses as much as digits as its factorization.

11100122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30748299 (or 30748280 counting only the distinct ones).

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

Adding to 11100122221 its reverse (12222100111), we get a palindrome (23322222332).

The spelling of 11100122221 in words is "eleven billion, one hundred million, one hundred twenty-two thousand, two hundred twenty-one".