25455134021 has 2 divisors, whose sum is σ = 25455134022. Its totient is φ = 25455134020.

The previous prime is 25455133999. The next prime is 25455134027. The reversal of 25455134021 is 12043155452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14457417121 + 10997716900 = 120239^2 + 104870^2 .

It is a cyclic number.

It is not a de Polignac number, because 25455134021 - 2¹⁸ = 25454871877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25455134027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12727567010 + 12727567011.

It is an arithmetic number, because the mean of its divisors is an integer number (12727567011).

Almost surely, 2^25455134021 is an apocalyptic number.

It is an amenable number.

25455134021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25455134021 is an equidigital number, since it uses as much as digits as its factorization.

25455134021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 25455134021 its reverse (12043155452), we get a palindrome (37498289473).

The spelling of 25455134021 in words is "twenty-five billion, four hundred fifty-five million, one hundred thirty-four thousand, twenty-one".