125043402521 has 4 divisors (see below), whose sum is σ = 125165875044. Its totient is φ = 124920930000.

The previous prime is 125043402499. The next prime is 125043402559. The reversal of 125043402521 is 125204340521.

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 94472628496 + 30570774025 = 307364^2 + 174845^2 .

It is a cyclic number.

It is not a de Polignac number, because 125043402521 - 2⁶ = 125043402457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125043405521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61234730 + ... + 61236771.

It is an arithmetic number, because the mean of its divisors is an integer number (31291468761).

Almost surely, 2^125043402521 is an apocalyptic number.

It is an amenable number.

125043402521 is a deficient number, since it is larger than the sum of its proper divisors (122472523).

125043402521 is a wasteful number, since it uses less digits than its factorization.

125043402521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122472522.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 125043402521 in words is "one hundred twenty-five billion, forty-three million, four hundred two thousand, five hundred twenty-one".