13442721 has 8 divisors (see below), whose sum is σ = 18024480. Its totient is φ = 8911392.

The previous prime is 13442707. The next prime is 13442743. The reversal of 13442721 is 12724431.

It is a happy number.

13442721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 13442721 - 2⁶ = 13442657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13442691 and 13442700.

It is not an unprimeable number, because it can be changed into a prime (13442701) 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, 11980 + ... + 13053.

It is an arithmetic number, because the mean of its divisors is an integer number (2253060).

Almost surely, 2^13442721 is an apocalyptic number.

It is an amenable number.

13442721 is a deficient number, since it is larger than the sum of its proper divisors (4581759).

13442721 is a wasteful number, since it uses less digits than its factorization.

13442721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25215.

The product of its digits is 1344, while the sum is 24.

The square root of 13442721 is about 3666.4316439830. The cubic root of 13442721 is about 237.7729220791.

The spelling of 13442721 in words is "thirteen million, four hundred forty-two thousand, seven hundred twenty-one".