4042052021 has 8 divisors (see below), whose sum is σ = 4620775104. Its totient is φ = 3463650720.

The previous prime is 4042052011. The next prime is 4042052051. The reversal of 4042052021 is 1202502404.

It is a happy number.

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 4042052021 - 2⁶ = 4042051957 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 = 4042051984 and 4042052002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4042052011) 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, 52895 + ... + 104316.

It is an arithmetic number, because the mean of its divisors is an integer number (577596888).

Almost surely, 2^4042052021 is an apocalyptic number.

It is an amenable number.

4042052021 is a deficient number, since it is larger than the sum of its proper divisors (578723083).

4042052021 is a wasteful number, since it uses less digits than its factorization.

4042052021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160891.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 4042052021 is about 63577.1344195380. The cubic root of 4042052021 is about 1592.9444563658.

Adding to 4042052021 its reverse (1202502404), we get a palindrome (5244554425).

The spelling of 4042052021 in words is "four billion, forty-two million, fifty-two thousand, twenty-one".