26438197170421 has 2 divisors, whose sum is σ = 26438197170422. Its totient is φ = 26438197170420.

The previous prime is 26438197170391. The next prime is 26438197170443. The reversal of 26438197170421 is 12407179183462.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16497488124100 + 9940709046321 = 4061710^2 + 3152889^2 .

It is a cyclic number.

It is not a de Polignac number, because 26438197170421 - 2¹³ = 26438197162229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26438197170461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13219098585210 + 13219098585211.

It is an arithmetic number, because the mean of its divisors is an integer number (13219098585211).

Almost surely, 2^{26438197170421} is an apocalyptic number.

It is an amenable number.

26438197170421 is a deficient number, since it is larger than the sum of its proper divisors (1).

26438197170421 is an equidigital number, since it uses as much as digits as its factorization.

26438197170421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 26438197170421 in words is "twenty-six trillion, four hundred thirty-eight billion, one hundred ninety-seven million, one hundred seventy thousand, four hundred twenty-one".