4021243420 has 12 divisors (see below), whose sum is σ = 8444611224. Its totient is φ = 1608497360.

The previous prime is 4021243381. The next prime is 4021243423. The reversal of 4021243420 is 243421204.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 4021243391 and 4021243400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021243423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100531066 + ... + 100531105.

It is an arithmetic number, because the mean of its divisors is an integer number (703717602).

Almost surely, 2^4021243420 is an apocalyptic number.

It is an amenable number.

4021243420 is an abundant number, since it is smaller than the sum of its proper divisors (4423367804).

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

4021243420 is a wasteful number, since it uses less digits than its factorization.

4021243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201062180 (or 201062178 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 4021243420 is about 63413.2747932166. The cubic root of 4021243420 is about 1590.2062440952.

Adding to 4021243420 its reverse (243421204), we get a palindrome (4264664624).

The spelling of 4021243420 in words is "four billion, twenty-one million, two hundred forty-three thousand, four hundred twenty".