26004721 has 2 divisors, whose sum is σ = 26004722. Its totient is φ = 26004720.

The previous prime is 26004709. The next prime is 26004761. The reversal of 26004721 is 12740062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 5574321 = 4520^2 + 2361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26004721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26004692 and 26004701.

It is not a weakly prime, because it can be changed into another prime (26004761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13002360 + 13002361.

It is an arithmetic number, because the mean of its divisors is an integer number (13002361).

Almost surely, 2^26004721 is an apocalyptic number.

It is an amenable number.

26004721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26004721 is an equidigital number, since it uses as much as digits as its factorization.

26004721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 26004721 is about 5099.4824247172. The cubic root of 26004721 is about 296.2675364529.

Adding to 26004721 its reverse (12740062), we get a palindrome (38744783).

The spelling of 26004721 in words is "twenty-six million, four thousand, seven hundred twenty-one".