63421 has 2 divisors, whose sum is σ = 63422. Its totient is φ = 63420.

The previous prime is 63419. The next prime is 63439. The reversal of 63421 is 12436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44100 + 19321 = 210^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 63421 - 2¹ = 63419 is a prime.

Together with 63419, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 63395 and 63404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31710 + 31711.

It is an arithmetic number, because the mean of its divisors is an integer number (31711).

2⁶³⁴²¹ is an apocalyptic number.

It is an amenable number.

63421 is a deficient number, since it is larger than the sum of its proper divisors (1).

63421 is an equidigital number, since it uses as much as digits as its factorization.

63421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 16.

The square root of 63421 is about 251.8352636149. The cubic root of 63421 is about 39.8790094009.

Adding to 63421 its reverse (12436), we get a palindrome (75857).

It can be divided in two parts, 63 and 421, that added together give a palindrome (484).

The spelling of 63421 in words is "sixty-three thousand, four hundred twenty-one".