13025721 has 8 divisors (see below), whose sum is σ = 17737344. Its totient is φ = 8498960.

The previous prime is 13025717. The next prime is 13025737. The reversal of 13025721 is 12752031.

13025721 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 a cyclic number.

It is not a de Polignac number, because 13025721 - 2² = 13025717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13021721) 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, 46050 + ... + 46331.

It is an arithmetic number, because the mean of its divisors is an integer number (2217168).

Almost surely, 2^13025721 is an apocalyptic number.

It is an amenable number.

13025721 is a deficient number, since it is larger than the sum of its proper divisors (4711623).

13025721 is an equidigital number, since it uses as much as digits as its factorization.

13025721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92431.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 13025721 is about 3609.1163738511. The cubic root of 13025721 is about 235.2884401485.

Adding to 13025721 its reverse (12752031), we get a palindrome (25777752).

The spelling of 13025721 in words is "thirteen million, twenty-five thousand, seven hundred twenty-one".