4002121 has 8 divisors (see below), whose sum is σ = 4087584. Its totient is φ = 3917760.

The previous prime is 4002113. The next prime is 4002127. The reversal of 4002121 is 1212004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4002121 - 2³ = 4002113 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4002098 and 4002107.

It is not an unprimeable number, because it can be changed into a prime (4002127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11926 + ... + 12256.

It is an arithmetic number, because the mean of its divisors is an integer number (510948).

Almost surely, 2^4002121 is an apocalyptic number.

It is an amenable number.

4002121 is a deficient number, since it is larger than the sum of its proper divisors (85463).

4002121 is a wasteful number, since it uses less digits than its factorization.

4002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 4002121 is about 2000.5301797274. The cubic root of 4002121 is about 158.7681575527.

Adding to 4002121 its reverse (1212004), we get a palindrome (5214125).

The spelling of 4002121 in words is "four million, two thousand, one hundred twenty-one".