125040051421 has 2 divisors, whose sum is σ = 125040051422. Its totient is φ = 125040051420.

The previous prime is 125040051407. The next prime is 125040051427. The reversal of 125040051421 is 124150040521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125040032100 + 19321 = 353610^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 125040051421 - 2¹⁷ = 125039920349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125040051427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62520025710 + 62520025711.

It is an arithmetic number, because the mean of its divisors is an integer number (62520025711).

Almost surely, 2^125040051421 is an apocalyptic number.

It is an amenable number.

125040051421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125040051421 is an equidigital number, since it uses as much as digits as its factorization.

125040051421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 125040051421 its reverse (124150040521), we get a palindrome (249190091942).

The spelling of 125040051421 in words is "one hundred twenty-five billion, forty million, fifty-one thousand, four hundred twenty-one".