11131221644 has 12 divisors (see below), whose sum is σ = 19504843344. Its totient is φ = 5558409264.

The previous prime is 11131221601. The next prime is 11131221653. The reversal of 11131221644 is 44612213111.

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, 1796912 + ... + 1803095.

It is an arithmetic number, because the mean of its divisors is an integer number (1625403612).

Almost surely, 2^11131221644 is an apocalyptic number.

It is an amenable number.

11131221644 is a deficient number, since it is larger than the sum of its proper divisors (8373621700).

11131221644 is a wasteful number, since it uses less digits than its factorization.

11131221644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600784 (or 3600782 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

Adding to 11131221644 its reverse (44612213111), we get a palindrome (55743434755).

The spelling of 11131221644 in words is "eleven billion, one hundred thirty-one million, two hundred twenty-one thousand, six hundred forty-four".