4002204121 has 4 divisors (see below), whose sum is σ = 4038921700. Its totient is φ = 3965486544.

The previous prime is 4002204109. The next prime is 4002204149. The reversal of 4002204121 is 1214022004.

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 2760346521 + 1241857600 = 52539^2 + 35240^2 .

It is a cyclic number.

It is not a de Polignac number, because 4002204121 - 2¹⁵ = 4002171353 is a prime.

It is a super-2 number, since 2×4002204121² = 32035275652298765282, 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 = 4002204095 and 4002204104.

It is not an unprimeable number, because it can be changed into a prime (4002204181) 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, 18358626 + ... + 18358843.

It is an arithmetic number, because the mean of its divisors is an integer number (1009730425).

Almost surely, 2^4002204121 is an apocalyptic number.

It is an amenable number.

4002204121 is a deficient number, since it is larger than the sum of its proper divisors (36717579).

4002204121 is a wasteful number, since it uses less digits than its factorization.

4002204121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36717578.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 4002204121 is about 63262.9759100850. The cubic root of 4002204121 is about 1587.6925670964.

Adding to 4002204121 its reverse (1214022004), we get a palindrome (5216226125).

The spelling of 4002204121 in words is "four billion, two million, two hundred four thousand, one hundred twenty-one".