26500021 has 2 divisors, whose sum is σ = 26500022. Its totient is φ = 26500020.

The previous prime is 26500013. The next prime is 26500039. The reversal of 26500021 is 12000562.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 7263025 = 4386^2 + 2695^2 .

It is a cyclic number.

It is not a de Polignac number, because 26500021 - 2³ = 26500013 is a prime.

It is a super-2 number, since 2×26500021² = 1404502226000882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26499968 and 26500004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26500091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13250010 + 13250011.

It is an arithmetic number, because the mean of its divisors is an integer number (13250011).

Almost surely, 2^26500021 is an apocalyptic number.

It is an amenable number.

26500021 is a deficient number, since it is larger than the sum of its proper divisors (1).

26500021 is an equidigital number, since it uses as much as digits as its factorization.

26500021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 26500021 is about 5147.8171101934. The cubic root of 26500021 is about 298.1366766402.

Adding to 26500021 its reverse (12000562), we get a palindrome (38500583).

The spelling of 26500021 in words is "twenty-six million, five hundred thousand, twenty-one".