13021881 has 16 divisors (see below), whose sum is σ = 18465408. Its totient is φ = 8134400.

The previous prime is 13021861. The next prime is 13021889. The reversal of 13021881 is 18812031.

It is a cyclic number.

It is not a de Polignac number, because 13021881 - 2⁷ = 13021753 is a prime.

It is a super-2 number, since 2×13021881² = 339138769556322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13021889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15451 + ... + 16271.

It is an arithmetic number, because the mean of its divisors is an integer number (1154088).

Almost surely, 2^13021881 is an apocalyptic number.

It is an amenable number.

13021881 is a deficient number, since it is larger than the sum of its proper divisors (5443527).

13021881 is a wasteful number, since it uses less digits than its factorization.

13021881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 13021881 is about 3608.5843484669. The cubic root of 13021881 is about 235.2653167603.

The spelling of 13021881 in words is "thirteen million, twenty-one thousand, eight hundred eighty-one".