4002512521 has 12 divisors (see below), whose sum is σ = 4929866388. Its totient is φ = 3228916992.

The previous prime is 4002512519. The next prime is 4002512543. The reversal of 4002512521 is 1252152004.

It can be written as a sum of positive squares in 2 ways, for example, as 2794602496 + 1207910025 = 52864^2 + 34755^2 .

It is not a de Polignac number, because 4002512521 - 2¹ = 4002512519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4002512492 and 4002512501.

It is not an unprimeable number, because it can be changed into a prime (4002512581) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2401636 + ... + 2403301.

It is an arithmetic number, because the mean of its divisors is an integer number (410822199).

Almost surely, 2^4002512521 is an apocalyptic number.

It is an amenable number.

4002512521 is a deficient number, since it is larger than the sum of its proper divisors (927353867).

4002512521 is a wasteful number, since it uses less digits than its factorization.

4002512521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4804968 (or 4804961 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 4002512521 is about 63265.4133077466. The cubic root of 4002512521 is about 1587.7333472762.

Adding to 4002512521 its reverse (1252152004), we get a palindrome (5254664525).

The spelling of 4002512521 in words is "four billion, two million, five hundred twelve thousand, five hundred twenty-one".