26320421 has 2 divisors, whose sum is σ = 26320422. Its totient is φ = 26320420.

The previous prime is 26320417. The next prime is 26320451. The reversal of 26320421 is 12402362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25897921 + 422500 = 5089^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 26320421 - 2² = 26320417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26320393 and 26320402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26320451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13160210 + 13160211.

It is an arithmetic number, because the mean of its divisors is an integer number (13160211).

Almost surely, 2^26320421 is an apocalyptic number.

It is an amenable number.

26320421 is a deficient number, since it is larger than the sum of its proper divisors (1).

26320421 is an equidigital number, since it uses as much as digits as its factorization.

26320421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 26320421 is about 5130.3431659101. The cubic root of 26320421 is about 297.4616234658.

Adding to 26320421 its reverse (12402362), we get a palindrome (38722783).

The spelling of 26320421 in words is "twenty-six million, three hundred twenty thousand, four hundred twenty-one".