13131021 has 16 divisors (see below), whose sum is σ = 18797184. Its totient is φ = 8123904.

The previous prime is 13131017. The next prime is 13131023. The reversal of 13131021 is 12013131.

It is not a de Polignac number, because 13131021 - 2² = 13131017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13130988 and 13131006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1960 + ... + 5486.

It is an arithmetic number, because the mean of its divisors is an integer number (1174824).

Almost surely, 2^13131021 is an apocalyptic number.

It is an amenable number.

13131021 is a deficient number, since it is larger than the sum of its proper divisors (5666163).

13131021 is a wasteful number, since it uses less digits than its factorization.

13131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3620.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 13131021 is about 3623.6750682146. The cubic root of 13131021 is about 235.9207636419.

Adding to 13131021 its reverse (12013131), we get a palindrome (25144152).

The spelling of 13131021 in words is "thirteen million, one hundred thirty-one thousand, twenty-one".