26245721 has 4 divisors (see below), whose sum is σ = 26275200. Its totient is φ = 26216244.

The previous prime is 26245697. The next prime is 26245727. The reversal of 26245721 is 12754262.

It is a happy number.

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 26245721 - 2¹⁰ = 26244697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26245727) 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, 13361 + ... + 15198.

It is an arithmetic number, because the mean of its divisors is an integer number (6568800).

Almost surely, 2^26245721 is an apocalyptic number.

It is an amenable number.

26245721 is a deficient number, since it is larger than the sum of its proper divisors (29479).

26245721 is an equidigital number, since it uses as much as digits as its factorization.

26245721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29478.

The product of its digits is 6720, while the sum is 29.

The square root of 26245721 is about 5123.0577783195. The cubic root of 26245721 is about 297.1799481625.

Adding to 26245721 its reverse (12754262), we get a palindrome (38999983).

The spelling of 26245721 in words is "twenty-six million, two hundred forty-five thousand, seven hundred twenty-one".