13043721 has 8 divisors (see below), whose sum is σ = 17861824. Its totient is φ = 8460720.

The previous prime is 13043689. The next prime is 13043729. The reversal of 13043721 is 12734031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13043721 - 2⁵ = 13043689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13043729) 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, 58645 + ... + 58866.

It is an arithmetic number, because the mean of its divisors is an integer number (2232728).

Almost surely, 2^13043721 is an apocalyptic number.

It is an amenable number.

13043721 is a deficient number, since it is larger than the sum of its proper divisors (4818103).

13043721 is a wasteful number, since it uses less digits than its factorization.

13043721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117551.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 13043721 is about 3611.6091981276. The cubic root of 13043721 is about 235.3967704942.

Adding to 13043721 its reverse (12734031), we get a palindrome (25777752).

The spelling of 13043721 in words is "thirteen million, forty-three thousand, seven hundred twenty-one".