5421 has 8 divisors (see below), whose sum is σ = 7840.
Its totient is φ = 3312.
The previous prime is 5419. The next prime is 5431. The reversal of 5421 is 1245.
5421 = T6 + T7 + ... +
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 5421 - 21 = 5419 is a prime.
It is a Duffinian number.
It is a plaindrome in base 8.
It is a nialpdrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 5397 and 5406.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (5431) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31 + ... + 108.
It is an arithmetic number, because the mean of its divisors is an integer number (980).
25421 is an apocalyptic number.
It is an amenable number.
5421 is a deficient number, since it is larger than the sum of its proper divisors (2419).
5421 is a wasteful number, since it uses less digits than its factorization.
5421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 155.
The product of its digits is 40, while the sum is 12.
The square root of 5421 is about 73.6274405368.
The cubic root of 5421 is about 17.5668193722.
Adding to 5421 its reverse (1245), we get a palindrome (6666).
The spelling of 5421 in words is "five thousand, four hundred twenty-one".