13121111 has 4 divisors (see below), whose sum is σ = 13159272. Its totient is φ = 13082952.

The previous prime is 13121099. The next prime is 13121117. The reversal of 13121111 is 11112131.

It is a happy number.

13121111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11112131 = 19 ⋅584849.

It is a cyclic number.

It is not a de Polignac number, because 13121111 - 2⁶ = 13121047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13121092 and 13121101.

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 3 ways as a sum of consecutive naturals, for example, 18560 + ... + 19253.

It is an arithmetic number, because the mean of its divisors is an integer number (3289818).

Almost surely, 2^13121111 is an apocalyptic number.

13121111 is a deficient number, since it is larger than the sum of its proper divisors (38161).

13121111 is an equidigital number, since it uses as much as digits as its factorization.

13121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38160.

The product of its digits is 6, while the sum is 11.

The square root of 13121111 is about 3622.3074137903. The cubic root of 13121111 is about 235.8613987945.

Adding to 13121111 its reverse (11112131), we get a palindrome (24233242).

The spelling of 13121111 in words is "thirteen million, one hundred twenty-one thousand, one hundred eleven".