4081421 has 2 divisors, whose sum is σ = 4081422. Its totient is φ = 4081420.

The previous prime is 4081397. The next prime is 4081423. The reversal of 4081421 is 1241804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2758921 + 1322500 = 1661^2 + 1150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4081421 is a prime.

Together with 4081423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 4081393 and 4081402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4081423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2040710 + 2040711.

It is an arithmetic number, because the mean of its divisors is an integer number (2040711).

Almost surely, 2^4081421 is an apocalyptic number.

It is an amenable number.

4081421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4081421 is an equidigital number, since it uses as much as digits as its factorization.

4081421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 4081421 is about 2020.2527069651. The cubic root of 4081421 is about 159.8099436013.

The spelling of 4081421 in words is "four million, eighty-one thousand, four hundred twenty-one".