4125421 has 2 divisors, whose sum is σ = 4125422. Its totient is φ = 4125420.

The previous prime is 4125419. The next prime is 4125427. The reversal of 4125421 is 1245214.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3861225 + 264196 = 1965^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 4125421 - 2¹ = 4125419 is a prime.

Together with 4125419, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4125427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2062710 + 2062711.

It is an arithmetic number, because the mean of its divisors is an integer number (2062711).

Almost surely, 2^4125421 is an apocalyptic number.

It is an amenable number.

4125421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4125421 is an equidigital number, since it uses as much as digits as its factorization.

4125421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 320, while the sum is 19.

The square root of 4125421 is about 2031.1132415501. The cubic root of 4125421 is about 160.3821723625.

The spelling of 4125421 in words is "four million, one hundred twenty-five thousand, four hundred twenty-one".