421421 has 16 divisors (see below), whose sum is σ = 567168. Its totient is φ = 302400.

The previous prime is 421417. The next prime is 421423. The reversal of 421421 is 124124.

It is not a de Polignac number, because 421421 - 2² = 421417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421396 and 421405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 791 + ... + 1211.

It is an arithmetic number, because the mean of its divisors is an integer number (35448).

2⁴²¹⁴²¹ is an apocalyptic number.

It is an amenable number.

421421 is a deficient number, since it is larger than the sum of its proper divisors (145747).

421421 is a wasteful number, since it uses less digits than its factorization.

421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452.

The product of its digits is 64, while the sum is 14.

The square root of 421421 is about 649.1694693992. The cubic root of 421421 is about 74.9730866397.

Adding to 421421 its reverse (124124), we get a palindrome (545545).

The spelling of 421421 in words is "four hundred twenty-one thousand, four hundred twenty-one", and thus it is an iban number.