4005146521 has 4 divisors (see below), whose sum is σ = 4025477412. Its totient is φ = 3984815632.

The previous prime is 4005146449. The next prime is 4005146527. The reversal of 4005146521 is 1256415004.

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 2566840896 + 1438305625 = 50664^2 + 37925^2 .

It is a cyclic number.

It is not a de Polignac number, because 4005146521 - 2²³ = 3996757913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4005146521.

It is not an unprimeable number, because it can be changed into a prime (4005146527) 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, 10165150 + ... + 10165543.

It is an arithmetic number, because the mean of its divisors is an integer number (1006369353).

Almost surely, 2^4005146521 is an apocalyptic number.

It is an amenable number.

4005146521 is a deficient number, since it is larger than the sum of its proper divisors (20330891).

4005146521 is a wasteful number, since it uses less digits than its factorization.

4005146521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20330890.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 4005146521 is about 63286.2269455211. The cubic root of 4005146521 is about 1588.0815596018.

The spelling of 4005146521 in words is "four billion, five million, one hundred forty-six thousand, five hundred twenty-one".