4042120221 has 6 divisors (see below), whose sum is σ = 5838618110. Its totient is φ = 2694746808.

The previous prime is 4042120189. The next prime is 4042120223. The reversal of 4042120221 is 1220212404.

4042120221 is a `hidden beast` number, since 4 + 0 + 421 + 20 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2453220900 + 1588899321 = 49530^2 + 39861^2 .

It is not a de Polignac number, because 4042120221 - 2⁵ = 4042120189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4042120194 and 4042120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042120223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 224562226 + ... + 224562243.

Almost surely, 2^4042120221 is an apocalyptic number.

It is an amenable number.

4042120221 is a deficient number, since it is larger than the sum of its proper divisors (1796497889).

4042120221 is a wasteful number, since it uses less digits than its factorization.

4042120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449124475 (or 449124472 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 4042120221 is about 63577.6707736293. The cubic root of 4042120221 is about 1592.9534153632.

Adding to 4042120221 its reverse (1220212404), we get a palindrome (5262332625).

The spelling of 4042120221 in words is "four billion, forty-two million, one hundred twenty thousand, two hundred twenty-one".