4021344121 has 2 divisors, whose sum is σ = 4021344122. Its totient is φ = 4021344120.

The previous prime is 4021344109. The next prime is 4021344139. The reversal of 4021344121 is 1214431204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3853926400 + 167417721 = 62080^2 + 12939^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021344121 - 2⁷ = 4021343993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021344092 and 4021344101.

It is not a weakly prime, because it can be changed into another prime (4021344161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010672060 + 2010672061.

It is an arithmetic number, because the mean of its divisors is an integer number (2010672061).

Almost surely, 2^4021344121 is an apocalyptic number.

It is an amenable number.

4021344121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021344121 is an equidigital number, since it uses as much as digits as its factorization.

4021344121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 4021344121 is about 63414.0687939199. The cubic root of 4021344121 is about 1590.2195181008.

Adding to 4021344121 its reverse (1214431204), we get a palindrome (5235775325).

The spelling of 4021344121 in words is "four billion, twenty-one million, three hundred forty-four thousand, one hundred twenty-one".