4021002012 has 24 divisors (see below), whose sum is σ = 9439902976. Its totient is φ = 1332110448.

The previous prime is 4021001983. The next prime is 4021002019. The reversal of 4021002012 is 2102001204.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021002019) 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, 1025908 + ... + 1029819.

Almost surely, 2^4021002012 is an apocalyptic number.

It is an amenable number.

4021002012 is an abundant number, since it is smaller than the sum of its proper divisors (5418900964).

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

4021002012 is a wasteful number, since it uses less digits than its factorization.

4021002012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055897 (or 2055895 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 4021002012 is about 63411.3713146152. The cubic root of 4021002012 is about 1590.1744217498.

Adding to 4021002012 its reverse (2102001204), we get a palindrome (6123003216).

The spelling of 4021002012 in words is "four billion, twenty-one million, two thousand, twelve".