13122215644 has 12 divisors (see below), whose sum is σ = 22969749600. Its totient is φ = 6559430048.

The previous prime is 13122215633. The next prime is 13122215671. The reversal of 13122215644 is 44651222131.

13122215644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 401764 + ... + 433195.

It is an arithmetic number, because the mean of its divisors is an integer number (1914145800).

Almost surely, 2^13122215644 is an apocalyptic number.

It is an amenable number.

13122215644 is a deficient number, since it is larger than the sum of its proper divisors (9847533956).

13122215644 is a wasteful number, since it uses less digits than its factorization.

13122215644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838892 (or 838890 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

Adding to 13122215644 its reverse (44651222131), we get a palindrome (57773437775).

The spelling of 13122215644 in words is "thirteen billion, one hundred twenty-two million, two hundred fifteen thousand, six hundred forty-four".