26401447021 has 2 divisors, whose sum is σ = 26401447022. Its totient is φ = 26401447020.

The previous prime is 26401447013. The next prime is 26401447091. The reversal of 26401447021 is 12074410462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25686472900 + 714974121 = 160270^2 + 26739^2 .

It is a cyclic number.

It is not a de Polignac number, because 26401447021 - 2³ = 26401447013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26401447091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13200723510 + 13200723511.

It is an arithmetic number, because the mean of its divisors is an integer number (13200723511).

Almost surely, 2^26401447021 is an apocalyptic number.

It is an amenable number.

26401447021 is a deficient number, since it is larger than the sum of its proper divisors (1).

26401447021 is an equidigital number, since it uses as much as digits as its factorization.

26401447021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 31.

Adding to 26401447021 its reverse (12074410462), we get a palindrome (38475857483).

The spelling of 26401447021 in words is "twenty-six billion, four hundred one million, four hundred forty-seven thousand, twenty-one".