13121118 has 24 divisors (see below), whose sum is σ = 28616328. Its totient is φ = 4344912.

The previous prime is 13121117. The next prime is 13121159. The reversal of 13121118 is 81112131.

It is a happy number.

13121118 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 13121118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121117) 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, 505 + ... + 5147.

It is an arithmetic number, because the mean of its divisors is an integer number (1192347).

Almost surely, 2^13121118 is an apocalyptic number.

13121118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13121118 is an abundant number, since it is smaller than the sum of its proper divisors (15495210).

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

13121118 is a wasteful number, since it uses less digits than its factorization.

13121118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4808 (or 4805 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 13121118 is about 3622.3083800251. The cubic root of 13121118 is about 235.8614407378.

Adding to 13121118 its reverse (81112131), we get a palindrome (94233249).

The spelling of 13121118 in words is "thirteen million, one hundred twenty-one thousand, one hundred eighteen".