26698921 has 2 divisors, whose sum is σ = 26698922. Its totient is φ = 26698920.

The previous prime is 26698871. The next prime is 26698951. The reversal of 26698921 is 12989662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25401600 + 1297321 = 5040^2 + 1139^2 .

It is a cyclic number.

It is not a de Polignac number, because 26698921 - 2¹⁵ = 26666153 is a prime.

It is not a weakly prime, because it can be changed into another prime (26698951) 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, 13349460 + 13349461.

It is an arithmetic number, because the mean of its divisors is an integer number (13349461).

Almost surely, 2^26698921 is an apocalyptic number.

It is an amenable number.

26698921 is a deficient number, since it is larger than the sum of its proper divisors (1).

26698921 is an equidigital number, since it uses as much as digits as its factorization.

26698921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 26698921 is about 5167.0998635598. The cubic root of 26698921 is about 298.8807218406.

The spelling of 26698921 in words is "twenty-six million, six hundred ninety-eight thousand, nine hundred twenty-one".