5125971421 has 2 divisors, whose sum is σ = 5125971422. Its totient is φ = 5125971420.

The previous prime is 5125971407. The next prime is 5125971463. The reversal of 5125971421 is 1241795215.

5125971421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4314519225 + 811452196 = 65685^2 + 28486^2 .

It is a cyclic number.

It is not a de Polignac number, because 5125971421 - 2⁹ = 5125970909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5125971491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2562985710 + 2562985711.

It is an arithmetic number, because the mean of its divisors is an integer number (2562985711).

Almost surely, 2^5125971421 is an apocalyptic number.

It is an amenable number.

5125971421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5125971421 is an equidigital number, since it uses as much as digits as its factorization.

5125971421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 37.

The square root of 5125971421 is about 71595.8896934733. The cubic root of 5125971421 is about 1724.2175456881.

The spelling of 5125971421 in words is "five billion, one hundred twenty-five million, nine hundred seventy-one thousand, four hundred twenty-one".