4221012042 has 72 divisors (see below), whose sum is σ = 10462629996. Its totient is φ = 1222354944.

The previous prime is 4221012041. The next prime is 4221012079. The reversal of 4221012042 is 2402101224.

It can be written as a sum of positive squares in 6 ways, for example, as 1098325881 + 3122686161 = 33141^2 + 55881^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (4221012041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 36418 + ... + 98834.

Almost surely, 2^4221012042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4221012042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5231314998).

4221012042 is an abundant number, since it is smaller than the sum of its proper divisors (6241617954).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221012042 is a wasteful number, since it uses less digits than its factorization.

4221012042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62472 (or 62452 counting only the distinct ones).

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

The square root of 4221012042 is about 64969.3161577063. The cubic root of 4221012042 is about 1616.1147612864.

Adding to 4221012042 its reverse (2402101224), we get a palindrome (6623113266).

The spelling of 4221012042 in words is "four billion, two hundred twenty-one million, twelve thousand, forty-two".