125464036021 has 4 divisors (see below), whose sum is σ = 132844273452. Its totient is φ = 118083798592.

The previous prime is 125464035973. The next prime is 125464036037. The reversal of 125464036021 is 120630464521.

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 78271252900 + 47192783121 = 279770^2 + 217239^2 .

It is a cyclic number.

It is not a de Polignac number, because 125464036021 - 2¹¹ = 125464033973 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 (125464036421) 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, 3690118690 + ... + 3690118723.

It is an arithmetic number, because the mean of its divisors is an integer number (33211068363).

Almost surely, 2^125464036021 is an apocalyptic number.

It is an amenable number.

125464036021 is a deficient number, since it is larger than the sum of its proper divisors (7380237431).

125464036021 is an equidigital number, since it uses as much as digits as its factorization.

125464036021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7380237430.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 125464036021 in words is "one hundred twenty-five billion, four hundred sixty-four million, thirty-six thousand, twenty-one".