26381021 has 2 divisors, whose sum is σ = 26381022. Its totient is φ = 26381020.

The previous prime is 26381011. The next prime is 26381041. The reversal of 26381021 is 12018362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18619225 + 7761796 = 4315^2 + 2786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26381021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26381011) 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, 13190510 + 13190511.

It is an arithmetic number, because the mean of its divisors is an integer number (13190511).

Almost surely, 2^26381021 is an apocalyptic number.

It is an amenable number.

26381021 is a deficient number, since it is larger than the sum of its proper divisors (1).

26381021 is an equidigital number, since it uses as much as digits as its factorization.

26381021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 26381021 is about 5136.2458079808. The cubic root of 26381021 is about 297.6897398473.

Adding to 26381021 its reverse (12018362), we get a palindrome (38399383).

The spelling of 26381021 in words is "twenty-six million, three hundred eighty-one thousand, twenty-one".