4021213421 has 8 divisors (see below), whose sum is σ = 4063760064. Its totient is φ = 3978734400.

The previous prime is 4021213393. The next prime is 4021213429. The reversal of 4021213421 is 1243121204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4021213421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4021213393 and 4021213402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021213429) 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, 107450 + ... + 139956.

It is an arithmetic number, because the mean of its divisors is an integer number (507970008).

Almost surely, 2^4021213421 is an apocalyptic number.

It is an amenable number.

4021213421 is a deficient number, since it is larger than the sum of its proper divisors (42546643).

4021213421 is a wasteful number, since it uses less digits than its factorization.

4021213421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33811.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 4021213421 is about 63413.0382571282. The cubic root of 4021213421 is about 1590.2022897035.

Adding to 4021213421 its reverse (1243121204), we get a palindrome (5264334625).

The spelling of 4021213421 in words is "four billion, twenty-one million, two hundred thirteen thousand, four hundred twenty-one".