125221424162521 has 2 divisors, whose sum is σ = 125221424162522. Its totient is φ = 125221424162520.

The previous prime is 125221424162503. The next prime is 125221424162561. The reversal of 125221424162521 is 125261424122521.

It is an a-pointer prime, because the next prime (125221424162561) can be obtained adding 125221424162521 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125003021225625 + 218402936896 = 11180475^2 + 467336^2 .

It is an emirp because it is prime and its reverse (125261424122521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125221424162521 - 2³⁷ = 125083985209049 is a prime.

It is not a weakly prime, because it can be changed into another prime (125221424162561) 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, 62610712081260 + 62610712081261.

It is an arithmetic number, because the mean of its divisors is an integer number (62610712081261).

Almost surely, 2^{125221424162521} is an apocalyptic number.

It is an amenable number.

125221424162521 is a deficient number, since it is larger than the sum of its proper divisors (1).

125221424162521 is an equidigital number, since it uses as much as digits as its factorization.

125221424162521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153600, while the sum is 40.

The spelling of 125221424162521 in words is "one hundred twenty-five trillion, two hundred twenty-one billion, four hundred twenty-four million, one hundred sixty-two thousand, five hundred twenty-one".