427421 has 2 divisors, whose sum is σ = 427422. Its totient is φ = 427420.

The previous prime is 427417. The next prime is 427423. The reversal of 427421 is 124724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290521 + 136900 = 539^2 + 370^2 .

It is a cyclic number.

It is not a de Polignac number, because 427421 - 2² = 427417 is a prime.

It is a super-2 number, since 2×427421² = 365377422482, which contains 22 as substring.

Together with 427423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 427393 and 427402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213710 + 213711.

It is an arithmetic number, because the mean of its divisors is an integer number (213711).

2⁴²⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

427421 is a deficient number, since it is larger than the sum of its proper divisors (1).

427421 is an equidigital number, since it uses as much as digits as its factorization.

427421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 20.

The square root of 427421 is about 653.7744259299. The cubic root of 427421 is about 75.3272221181.

It can be divided in two parts, 427 and 421, that added together give a palindrome (848).

The spelling of 427421 in words is "four hundred twenty-seven thousand, four hundred twenty-one", and thus it is an iban number.