125401484821 has 4 divisors (see below), whose sum is σ = 125402251500. Its totient is φ = 125400718144.

The previous prime is 125401484809. The next prime is 125401484837. The reversal of 125401484821 is 128484104521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 128484104521 = 131 ⋅980794691.

It can be written as a sum of positive squares in 2 ways, for example, as 120974578596 + 4426906225 = 347814^2 + 66535^2 .

It is a cyclic number.

It is not a de Polignac number, because 125401484821 - 2⁷ = 125401484693 is a prime.

It is a super-2 number, since 2×125401484821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165401484821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28516 + ... + 501613.

It is an arithmetic number, because the mean of its divisors is an integer number (31350562875).

Almost surely, 2^125401484821 is an apocalyptic number.

It is an amenable number.

125401484821 is a deficient number, since it is larger than the sum of its proper divisors (766679).

125401484821 is an equidigital number, since it uses as much as digits as its factorization.

125401484821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766678.

The product of its (nonzero) digits is 81920, while the sum is 40.

The spelling of 125401484821 in words is "one hundred twenty-five billion, four hundred one million, four hundred eighty-four thousand, eight hundred twenty-one".