13211881 has 8 divisors (see below), whose sum is σ = 13708800. Its totient is φ = 12723360.

The previous prime is 13211843. The next prime is 13211899. The reversal of 13211881 is 18811231.

13211881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13211881 - 2²¹ = 11114729 is a prime.

It is a super-2 number, since 2×13211881² = 349107599116322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13211801) 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, 1200 + ... + 5278.

It is an arithmetic number, because the mean of its divisors is an integer number (1713600).

Almost surely, 2^13211881 is an apocalyptic number.

It is an amenable number.

13211881 is a deficient number, since it is larger than the sum of its proper divisors (496919).

13211881 is an equidigital number, since it uses as much as digits as its factorization.

13211881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4199.

The product of its digits is 384, while the sum is 25.

The square root of 13211881 is about 3634.8151259727. The cubic root of 13211881 is about 236.4040347436.

The spelling of 13211881 in words is "thirteen million, two hundred eleven thousand, eight hundred eighty-one".