26504234221 has 2 divisors, whose sum is σ = 26504234222. Its totient is φ = 26504234220.

The previous prime is 26504234191. The next prime is 26504234249. The reversal of 26504234221 is 12243240562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25257155625 + 1247078596 = 158925^2 + 35314^2 .

It is a cyclic number.

It is not a de Polignac number, because 26504234221 - 2⁷ = 26504234093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26504234291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13252117110 + 13252117111.

It is an arithmetic number, because the mean of its divisors is an integer number (13252117111).

Almost surely, 2^26504234221 is an apocalyptic number.

It is an amenable number.

26504234221 is a deficient number, since it is larger than the sum of its proper divisors (1).

26504234221 is an equidigital number, since it uses as much as digits as its factorization.

26504234221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 26504234221 its reverse (12243240562), we get a palindrome (38747474783).

The spelling of 26504234221 in words is "twenty-six billion, five hundred four million, two hundred thirty-four thousand, two hundred twenty-one".