125354443355221 has 4 divisors (see below), whose sum is σ = 129677010367500. Its totient is φ = 121031876342944.

The previous prime is 125354443355201. The next prime is 125354443355233. The reversal of 125354443355221 is 122553344453521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64366699768996 + 60987743586225 = 8022886^2 + 7809465^2 .

It is a cyclic number.

It is not a de Polignac number, because 125354443355221 - 2⁹ = 125354443354709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125354443355201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2161283506096 + ... + 2161283506153.

It is an arithmetic number, because the mean of its divisors is an integer number (32419252591875).

Almost surely, 2^{125354443355221} is an apocalyptic number.

It is an amenable number.

125354443355221 is a deficient number, since it is larger than the sum of its proper divisors (4322567012279).

125354443355221 is an equidigital number, since it uses as much as digits as its factorization.

125354443355221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4322567012278.

The product of its digits is 8640000, while the sum is 49.

The spelling of 125354443355221 in words is "one hundred twenty-five trillion, three hundred fifty-four billion, four hundred forty-three million, three hundred fifty-five thousand, two hundred twenty-one".