4002500121 has 4 divisors (see below), whose sum is σ = 5336666832. Its totient is φ = 2668333412.

The previous prime is 4002500107. The next prime is 4002500141. The reversal of 4002500121 is 1210052004.

4002500121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4002500121 - 2²⁵ = 3968945689 is a prime.

It is a super-3 number, since 3×4002500121³ (a number of 30 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 4002500121.

It is not an unprimeable number, because it can be changed into a prime (4002500141) 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, 667083351 + ... + 667083356.

It is an arithmetic number, because the mean of its divisors is an integer number (1334166708).

Almost surely, 2^4002500121 is an apocalyptic number.

It is an amenable number.

4002500121 is a deficient number, since it is larger than the sum of its proper divisors (1334166711).

4002500121 is a wasteful number, since it uses less digits than its factorization.

4002500121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334166710.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 4002500121 is about 63265.3153078367. The cubic root of 4002500121 is about 1587.7317076466.

Adding to 4002500121 its reverse (1210052004), we get a palindrome (5212552125).

The spelling of 4002500121 in words is "four billion, two million, five hundred thousand, one hundred twenty-one".