4140421 has 2 divisors, whose sum is σ = 4140422. Its totient is φ = 4140420.

The previous prime is 4140419. The next prime is 4140439. The reversal of 4140421 is 1240414.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3189796 + 950625 = 1786^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 4140421 - 2¹ = 4140419 is a prime.

Together with 4140419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4140395 and 4140404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4140481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2070210 + 2070211.

It is an arithmetic number, because the mean of its divisors is an integer number (2070211).

Almost surely, 2^4140421 is an apocalyptic number.

It is an amenable number.

4140421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4140421 is an equidigital number, since it uses as much as digits as its factorization.

4140421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 4140421 is about 2034.8024474135. The cubic root of 4140421 is about 160.5763200401.

Adding to 4140421 its reverse (1240414), we get a palindrome (5380835).

The spelling of 4140421 in words is "four million, one hundred forty thousand, four hundred twenty-one".