26573613421 has 2 divisors, whose sum is σ = 26573613422. Its totient is φ = 26573613420.

The previous prime is 26573613403. The next prime is 26573613467. The reversal of 26573613421 is 12431637562.

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., 13598125321 + 12975488100 = 116611^2 + 113910^2 .

It is a cyclic number.

It is not a de Polignac number, because 26573613421 - 2¹⁷ = 26573482349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26573613481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13286806710 + 13286806711.

It is an arithmetic number, because the mean of its divisors is an integer number (13286806711).

Almost surely, 2^26573613421 is an apocalyptic number.

It is an amenable number.

26573613421 is a deficient number, since it is larger than the sum of its proper divisors (1).

26573613421 is an equidigital number, since it uses as much as digits as its factorization.

26573613421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 40.

The spelling of 26573613421 in words is "twenty-six billion, five hundred seventy-three million, six hundred thirteen thousand, four hundred twenty-one".