13121121044 has 12 divisors (see below), whose sum is σ = 22966889568. Its totient is φ = 6559152600.

The previous prime is 13121121031. The next prime is 13121121047. The reversal of 13121121044 is 44012112131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121121047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330872 + ... + 368399.

It is an arithmetic number, because the mean of its divisors is an integer number (1913907464).

Almost surely, 2^13121121044 is an apocalyptic number.

It is an amenable number.

13121121044 is a deficient number, since it is larger than the sum of its proper divisors (9845768524).

13121121044 is a wasteful number, since it uses less digits than its factorization.

13121121044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703966 (or 703964 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 13121121044 its reverse (44012112131), we get a palindrome (57133233175).

The spelling of 13121121044 in words is "thirteen billion, one hundred twenty-one million, one hundred twenty-one thousand, forty-four".