4182421 has 2 divisors, whose sum is σ = 4182422. Its totient is φ = 4182420.

The previous prime is 4182419. The next prime is 4182433. The reversal of 4182421 is 1242814.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4100625 + 81796 = 2025^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 4182421 - 2¹ = 4182419 is a prime.

Together with 4182419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 4182392 and 4182401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4182461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2091210 + 2091211.

It is an arithmetic number, because the mean of its divisors is an integer number (2091211).

Almost surely, 2^4182421 is an apocalyptic number.

It is an amenable number.

4182421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4182421 is an equidigital number, since it uses as much as digits as its factorization.

4182421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 22.

The square root of 4182421 is about 2045.0968192240. The cubic root of 4182421 is about 161.1174509154.

The spelling of 4182421 in words is "four million, one hundred eighty-two thousand, four hundred twenty-one".