4021040042 has 4 divisors (see below), whose sum is σ = 6031560066. Its totient is φ = 2010520020.

The previous prime is 4021040011. The next prime is 4021040063. The reversal of 4021040042 is 2400401204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4018418881 + 2621161 = 63391^2 + 1619^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 4021040042.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1005260009 + ... + 1005260012.

Almost surely, 2^4021040042 is an apocalyptic number.

4021040042 is a deficient number, since it is larger than the sum of its proper divisors (2010520024).

4021040042 is a wasteful number, since it uses less digits than its factorization.

4021040042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2010520023.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 4021040042 is about 63411.6711812581. The cubic root of 4021040042 is about 1590.1794349399.

Adding to 4021040042 its reverse (2400401204), we get a palindrome (6421441246).

The spelling of 4021040042 in words is "four billion, twenty-one million, forty thousand, forty-two".