13042921 has 4 divisors (see below), whose sum is σ = 13050244. Its totient is φ = 13035600.

The previous prime is 13042919. The next prime is 13042933. The reversal of 13042921 is 12924031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12524521 + 518400 = 3539^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 13042921 - 2¹ = 13042919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13042892 and 13042901.

It is not an unprimeable number, because it can be changed into a prime (13042901) 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 3 ways as a sum of consecutive naturals, for example, 931 + ... + 5191.

It is an arithmetic number, because the mean of its divisors is an integer number (3262561).

Almost surely, 2^13042921 is an apocalyptic number.

It is an amenable number.

13042921 is a deficient number, since it is larger than the sum of its proper divisors (7323).

13042921 is an equidigital number, since it uses as much as digits as its factorization.

13042921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7322.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 13042921 is about 3611.4984424751. The cubic root of 13042921 is about 235.3919579292.

Adding to 13042921 its reverse (12924031), we get a palindrome (25966952).

It can be divided in two parts, 1304 and 2921, that added together give a square (4225 = 65²).

The spelling of 13042921 in words is "thirteen million, forty-two thousand, nine hundred twenty-one".