26016821 has 2 divisors, whose sum is σ = 26016822. Its totient is φ = 26016820.

The previous prime is 26016797. The next prime is 26016827. The reversal of 26016821 is 12861062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20376196 + 5640625 = 4514^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 26016821 - 2²² = 21822517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26016827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13008410 + 13008411.

It is an arithmetic number, because the mean of its divisors is an integer number (13008411).

Almost surely, 2^26016821 is an apocalyptic number.

It is an amenable number.

26016821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26016821 is an equidigital number, since it uses as much as digits as its factorization.

26016821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 26016821 is about 5100.6686816534. The cubic root of 26016821 is about 296.3134804353.

Adding to 26016821 its reverse (12861062), we get a palindrome (38877883).

The spelling of 26016821 in words is "twenty-six million, sixteen thousand, eight hundred twenty-one".