4123421 has 2 divisors, whose sum is σ = 4123422. Its totient is φ = 4123420.

The previous prime is 4123387. The next prime is 4123439. The reversal of 4123421 is 1243214.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 1466521 = 1630^2 + 1211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4123421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4123421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4123121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2061710 + 2061711.

It is an arithmetic number, because the mean of its divisors is an integer number (2061711).

Almost surely, 2^4123421 is an apocalyptic number.

It is an amenable number.

4123421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4123421 is an equidigital number, since it uses as much as digits as its factorization.

4123421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 17.

The square root of 4123421 is about 2030.6208410237. The cubic root of 4123421 is about 160.3562504671.

Adding to 4123421 its reverse (1243214), we get a palindrome (5366635).

The spelling of 4123421 in words is "four million, one hundred twenty-three thousand, four hundred twenty-one".