125320885021 has 2 divisors, whose sum is σ = 125320885022. Its totient is φ = 125320885020.

The previous prime is 125320884979. The next prime is 125320885031. The reversal of 125320885021 is 120588023521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124633711225 + 687173796 = 353035^2 + 26214^2 .

It is a cyclic number.

It is not a de Polignac number, because 125320885021 - 2¹³ = 125320876829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125320885031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62660442510 + 62660442511.

It is an arithmetic number, because the mean of its divisors is an integer number (62660442511).

Almost surely, 2^125320885021 is an apocalyptic number.

It is an amenable number.

125320885021 is a deficient number, since it is larger than the sum of its proper divisors (1).

125320885021 is an equidigital number, since it uses as much as digits as its factorization.

125320885021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 125320885021 in words is "one hundred twenty-five billion, three hundred twenty million, eight hundred eighty-five thousand, twenty-one".