4125721013 has 4 divisors (see below), whose sum is σ = 4126241388. Its totient is φ = 4125200640.

The previous prime is 4125720983. The next prime is 4125721027. The reversal of 4125721013 is 3101275214.

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 1384360849 + 2741360164 = 37207^2 + 52358^2 .

It is a cyclic number.

It is not a de Polignac number, because 4125721013 - 2¹⁶ = 4125655477 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 (4125721513) 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, 248108 + ... + 264213.

It is an arithmetic number, because the mean of its divisors is an integer number (1031560347).

Almost surely, 2^4125721013 is an apocalyptic number.

It is an amenable number.

4125721013 is a deficient number, since it is larger than the sum of its proper divisors (520375).

4125721013 is an equidigital number, since it uses as much as digits as its factorization.

4125721013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520374.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 4125721013 is about 64231.7757266604. The cubic root of 4125721013 is about 1603.8606009259.

Adding to 4125721013 its reverse (3101275214), we get a palindrome (7226996227).

The spelling of 4125721013 in words is "four billion, one hundred twenty-five million, seven hundred twenty-one thousand, thirteen".