26643121 has 2 divisors, whose sum is σ = 26643122. Its totient is φ = 26643120.

The previous prime is 26643119. The next prime is 26643139. The reversal of 26643121 is 12134662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24206400 + 2436721 = 4920^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 26643121 - 2¹ = 26643119 is a prime.

Together with 26643119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26643151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13321560 + 13321561.

It is an arithmetic number, because the mean of its divisors is an integer number (13321561).

Almost surely, 2^26643121 is an apocalyptic number.

It is an amenable number.

26643121 is a deficient number, since it is larger than the sum of its proper divisors (1).

26643121 is an equidigital number, since it uses as much as digits as its factorization.

26643121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 25.

The square root of 26643121 is about 5161.6974921047. The cubic root of 26643121 is about 298.6723591591.

Adding to 26643121 its reverse (12134662), we get a palindrome (38777783).

The spelling of 26643121 in words is "twenty-six million, six hundred forty-three thousand, one hundred twenty-one".