125127375721 has 2 divisors, whose sum is σ = 125127375722. Its totient is φ = 125127375720.

The previous prime is 125127375679. The next prime is 125127375781. The reversal of 125127375721 is 127573721521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124948110400 + 179265321 = 353480^2 + 13389^2 .

It is an emirp because it is prime and its reverse (127573721521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125127375721 - 2¹³ = 125127367529 is a prime.

It is not a weakly prime, because it can be changed into another prime (125127375781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62563687860 + 62563687861.

It is an arithmetic number, because the mean of its divisors is an integer number (62563687861).

Almost surely, 2^125127375721 is an apocalyptic number.

It is an amenable number.

125127375721 is a deficient number, since it is larger than the sum of its proper divisors (1).

125127375721 is an equidigital number, since it uses as much as digits as its factorization.

125127375721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 205800, while the sum is 43.

The spelling of 125127375721 in words is "one hundred twenty-five billion, one hundred twenty-seven million, three hundred seventy-five thousand, seven hundred twenty-one".