11001221012 has 12 divisors (see below), whose sum is σ = 19258070580. Its totient is φ = 5498915136.

The previous prime is 11001221009. The next prime is 11001221039. The reversal of 11001221012 is 21012210011.

It can be written as a sum of positive squares in 2 ways, for example, as 9270993796 + 1730227216 = 96286^2 + 41596^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11001220984 and 11001221002.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 409187 + ... + 435242.

It is an arithmetic number, because the mean of its divisors is an integer number (1604839215).

Almost surely, 2^11001221012 is an apocalyptic number.

It is an amenable number.

11001221012 is a deficient number, since it is larger than the sum of its proper divisors (8256849568).

11001221012 is a wasteful number, since it uses less digits than its factorization.

11001221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847690 (or 847688 counting only the distinct ones).

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

Adding to 11001221012 its reverse (21012210011), we get a palindrome (32013431023).

The spelling of 11001221012 in words is "eleven billion, one million, two hundred twenty-one thousand, twelve".