13121155 has 16 divisors (see below), whose sum is σ = 16671744. Its totient is φ = 9892960.

The previous prime is 13121117. The next prime is 13121159. The reversal of 13121155 is 55112131.

It is not a de Polignac number, because 13121155 - 2⁹ = 13120643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121159) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7362 + ... + 8968.

It is an arithmetic number, because the mean of its divisors is an integer number (1041984).

Almost surely, 2^13121155 is an apocalyptic number.

13121155 is a deficient number, since it is larger than the sum of its proper divisors (3550589).

13121155 is a wasteful number, since it uses less digits than its factorization.

13121155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1706.

The product of its digits is 150, while the sum is 19.

The square root of 13121155 is about 3622.3134872620. The cubic root of 13121155 is about 235.8616624381.

Adding to 13121155 its reverse (55112131), we get a palindrome (68233286).

The spelling of 13121155 in words is "thirteen million, one hundred twenty-one thousand, one hundred fifty-five".