26697421 has 2 divisors, whose sum is σ = 26697422. Its totient is φ = 26697420.

The previous prime is 26697409. The next prime is 26697427. The reversal of 26697421 is 12479662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21808900 + 4888521 = 4670^2 + 2211^2 .

It is a cyclic number.

It is not a de Polignac number, because 26697421 - 2⁵ = 26697389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26697427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13348710 + 13348711.

It is an arithmetic number, because the mean of its divisors is an integer number (13348711).

Almost surely, 2^26697421 is an apocalyptic number.

It is an amenable number.

26697421 is a deficient number, since it is larger than the sum of its proper divisors (1).

26697421 is an equidigital number, since it uses as much as digits as its factorization.

26697421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 26697421 is about 5166.9547124007. The cubic root of 26697421 is about 298.8751244924.

The spelling of 26697421 in words is "twenty-six million, six hundred ninety-seven thousand, four hundred twenty-one".