4240421 has 2 divisors, whose sum is σ = 4240422. Its totient is φ = 4240420.

The previous prime is 4240417. The next prime is 4240433. The reversal of 4240421 is 1240424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3189796 + 1050625 = 1786^2 + 1025^2 .

It is a cyclic number.

It is not a de Polignac number, because 4240421 - 2² = 4240417 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4240421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4240451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2120210 + 2120211.

It is an arithmetic number, because the mean of its divisors is an integer number (2120211).

Almost surely, 2^4240421 is an apocalyptic number.

It is an amenable number.

4240421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4240421 is an equidigital number, since it uses as much as digits as its factorization.

4240421 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 17.

The square root of 4240421 is about 2059.2282534969. The cubic root of 4240421 is about 161.8588034559.

Adding to 4240421 its reverse (1240424), we get a palindrome (5480845).

The spelling of 4240421 in words is "four million, two hundred forty thousand, four hundred twenty-one".