4021321 has 4 divisors (see below), whose sum is σ = 4119444. Its totient is φ = 3923200.

The previous prime is 4021309. The next prime is 4021349. The reversal of 4021321 is 1231204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164025 + 3857296 = 405^2 + 1964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4021321 is a prime.

It is a Duffinian number.

4021321 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021301) 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, 49000 + ... + 49081.

It is an arithmetic number, because the mean of its divisors is an integer number (1029861).

Almost surely, 2^4021321 is an apocalyptic number.

4021321 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

4021321 is a deficient number, since it is larger than the sum of its proper divisors (98123).

4021321 is an equidigital number, since it uses as much as digits as its factorization.

4021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98122.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 4021321 is about 2005.3231659760. The cubic root of 4021321 is about 159.0216470402.

Adding to 4021321 its reverse (1231204), we get a palindrome (5252525).

The spelling of 4021321 in words is "four million, twenty-one thousand, three hundred twenty-one".