4000421121 has 8 divisors (see below), whose sum is σ = 5447382144. Its totient is φ = 2610203760.

The previous prime is 4000421023. The next prime is 4000421123. The reversal of 4000421121 is 1211240004.

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

It is not a de Polignac number, because 4000421121 - 2⁷ = 4000420993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4000421121.

It is not an unprimeable number, because it can be changed into a prime (4000421123) 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, 14185750 + ... + 14186031.

It is an arithmetic number, because the mean of its divisors is an integer number (680922768).

Almost surely, 2^4000421121 is an apocalyptic number.

It is an amenable number.

4000421121 is a deficient number, since it is larger than the sum of its proper divisors (1446961023).

4000421121 is a wasteful number, since it uses less digits than its factorization.

4000421121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28371831.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 4000421121 is about 63248.8823695723. The cubic root of 4000421121 is about 1587.4567573399.

Adding to 4000421121 its reverse (1211240004), we get a palindrome (5211661125).

The spelling of 4000421121 in words is "four billion, four hundred twenty-one thousand, one hundred twenty-one".