4004221421 has 8 divisors (see below), whose sum is σ = 4030355040. Its totient is φ = 3978172368.

The previous prime is 4004221411. The next prime is 4004221451. The reversal of 4004221421 is 1241224004.

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 4004221421 - 2⁶ = 4004221357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4004221393 and 4004221402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4004221411) 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, 75290 + ... + 116948.

It is an arithmetic number, because the mean of its divisors is an integer number (503794380).

Almost surely, 2^4004221421 is an apocalyptic number.

It is an amenable number.

4004221421 is a deficient number, since it is larger than the sum of its proper divisors (26133619).

4004221421 is a wasteful number, since it uses less digits than its factorization.

4004221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42283.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 4004221421 is about 63278.9176661548. The cubic root of 4004221421 is about 1587.9592796494.

Adding to 4004221421 its reverse (1241224004), we get a palindrome (5245445425).

The spelling of 4004221421 in words is "four billion, four million, two hundred twenty-one thousand, four hundred twenty-one".