11012222221 has 36 divisors (see below), whose sum is σ = 15163789116. Its totient is φ = 7920823680.

The previous prime is 11012222183. The next prime is 11012222227. The reversal of 11012222221 is 12222221011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5717476996 + 5294745225 = 75614^2 + 72765^2 .

It is not a de Polignac number, because 11012222221 - 2⁹ = 11012221709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11012222195 and 11012222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012222227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5641 + ... + 148513.

Almost surely, 2^11012222221 is an apocalyptic number.

11012222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11012222221 is a deficient number, since it is larger than the sum of its proper divisors (4151566895).

11012222221 is a wasteful number, since it uses less digits than its factorization.

11012222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142922 (or 142904 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 11012222221 its reverse (12222221011), we get a palindrome (23234443232).

The spelling of 11012222221 in words is "eleven billion, twelve million, two hundred twenty-two thousand, two hundred twenty-one".