25973444438021 has 2 divisors, whose sum is σ = 25973444438022. Its totient is φ = 25973444438020.

The previous prime is 25973444437937. The next prime is 25973444438027. The reversal of 25973444438021 is 12083444437952.

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., 24282365265796 + 1691079172225 = 4927714^2 + 1300415^2 .

It is a cyclic number.

It is not a de Polignac number, because 25973444438021 - 2⁴² = 21575397926917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25973444438027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12986722219010 + 12986722219011.

It is an arithmetic number, because the mean of its divisors is an integer number (12986722219011).

Almost surely, 2^{25973444438021} is an apocalyptic number.

It is an amenable number.

25973444438021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25973444438021 is an equidigital number, since it uses as much as digits as its factorization.

25973444438021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23224320, while the sum is 56.

The spelling of 25973444438021 in words is "twenty-five trillion, nine hundred seventy-three billion, four hundred forty-four million, four hundred thirty-eight thousand, twenty-one".