13111921 has 8 divisors (see below), whose sum is σ = 13356288. Its totient is φ = 12870000.

The previous prime is 13111907. The next prime is 13111927. The reversal of 13111921 is 12911131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13111921 - 2⁹ = 13111409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13111927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12736 + ... + 13726.

It is an arithmetic number, because the mean of its divisors is an integer number (1669536).

Almost surely, 2^13111921 is an apocalyptic number.

It is an amenable number.

13111921 is a deficient number, since it is larger than the sum of its proper divisors (244367).

13111921 is a wasteful number, since it uses less digits than its factorization.

13111921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223.

The product of its digits is 54, while the sum is 19.

The square root of 13111921 is about 3621.0386631463. The cubic root of 13111921 is about 235.8063203156.

It can be divided in two parts, 131 and 11921, that multiplied together give a palindrome (1561651).

The spelling of 13111921 in words is "thirteen million, one hundred eleven thousand, nine hundred twenty-one".