13075721 has 4 divisors (see below), whose sum is σ = 13198032. Its totient is φ = 12953412.

The previous prime is 13075709. The next prime is 13075739. The reversal of 13075721 is 12757031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13075721 - 2¹⁴ = 13059337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (13075421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60995 + ... + 61208.

It is an arithmetic number, because the mean of its divisors is an integer number (3299508).

Almost surely, 2^13075721 is an apocalyptic number.

It is an amenable number.

13075721 is a deficient number, since it is larger than the sum of its proper divisors (122311).

13075721 is a wasteful number, since it uses less digits than its factorization.

13075721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122310.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 13075721 is about 3616.0366425135. The cubic root of 13075721 is about 235.5891119557.

The spelling of 13075721 in words is "thirteen million, seventy-five thousand, seven hundred twenty-one".