4002021242 has 4 divisors (see below), whose sum is σ = 6003031866. Its totient is φ = 2001010620.

The previous prime is 4002021241. The next prime is 4002021251. The reversal of 4002021242 is 2421202004.

It is a happy number.

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., 3991838761 + 10182481 = 63181^2 + 3191^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 4002021242.

It is not an unprimeable number, because it can be changed into a prime (4002021241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000505309 + ... + 1000505312.

Almost surely, 2^4002021242 is an apocalyptic number.

4002021242 is a deficient number, since it is larger than the sum of its proper divisors (2001010624).

4002021242 is a wasteful number, since it uses less digits than its factorization.

4002021242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001010623.

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

The square root of 4002021242 is about 63261.5305063038. The cubic root of 4002021242 is about 1587.6683837512.

Adding to 4002021242 its reverse (2421202004), we get a palindrome (6423223246).

The spelling of 4002021242 in words is "four billion, two million, twenty-one thousand, two hundred forty-two".