4013125321 has 4 divisors (see below), whose sum is σ = 4021831044. Its totient is φ = 4004419600.

The previous prime is 4013125313. The next prime is 4013125327. The reversal of 4013125321 is 1235213104.

It is a happy number.

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 1727233600 + 2285891721 = 41560^2 + 47811^2 .

It is a cyclic number.

It is not a de Polignac number, because 4013125321 - 2³ = 4013125313 is a prime.

It is a super-2 number, since 2×4013125321² = 32210349684102706082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4013125292 and 4013125301.

It is not an unprimeable number, because it can be changed into a prime (4013125327) 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, 4352170 + ... + 4353091.

It is an arithmetic number, because the mean of its divisors is an integer number (1005457761).

Almost surely, 2^4013125321 is an apocalyptic number.

It is an amenable number.

4013125321 is a deficient number, since it is larger than the sum of its proper divisors (8705723).

4013125321 is an equidigital number, since it uses as much as digits as its factorization.

4013125321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8705722.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 4013125321 is about 63349.2329945675. The cubic root of 4013125321 is about 1589.1354187028.

Adding to 4013125321 its reverse (1235213104), we get a palindrome (5248338425).

The spelling of 4013125321 in words is "four billion, thirteen million, one hundred twenty-five thousand, three hundred twenty-one".