13121533044 has 36 divisors (see below), whose sum is σ = 33622686916. Its totient is φ = 4313927808.

The previous prime is 13121533037. The next prime is 13121533049. The reversal of 13121533044 is 44033512131.

It is a happy number.

13121533044 is a `hidden beast` number, since 1 + 3 + 121 + 533 + 0 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5158112400 + 7963420644 = 71820^2 + 89238^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 13121532999 and 13121533017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121533049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2493859 + ... + 2499114.

Almost surely, 2^13121533044 is an apocalyptic number.

It is an amenable number.

13121533044 is an abundant number, since it is smaller than the sum of its proper divisors (20501153872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13121533044 is a wasteful number, since it uses less digits than its factorization.

13121533044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993056 (or 4993051 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The spelling of 13121533044 in words is "thirteen billion, one hundred twenty-one million, five hundred thirty-three thousand, forty-four".