25938376860421 has 2 divisors, whose sum is σ = 25938376860422. Its totient is φ = 25938376860420.

The previous prime is 25938376860353. The next prime is 25938376860457. The reversal of 25938376860421 is 12406867383952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23520075062500 + 2418301797921 = 4849750^2 + 1555089^2 .

It is a cyclic number.

It is not a de Polignac number, because 25938376860421 - 2¹⁹ = 25938376336133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25938376860821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12969188430210 + 12969188430211.

It is an arithmetic number, because the mean of its divisors is an integer number (12969188430211).

It is a 1-persistent number, because it is pandigital, but 2⋅25938376860421 = 51876753720842 is not.

Almost surely, 2^{25938376860421} is an apocalyptic number.

It is an amenable number.

25938376860421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25938376860421 is an equidigital number, since it uses as much as digits as its factorization.

25938376860421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104509440, while the sum is 64.

The spelling of 25938376860421 in words is "twenty-five trillion, nine hundred thirty-eight billion, three hundred seventy-six million, eight hundred sixty thousand, four hundred twenty-one".