47421 has 12 divisors (see below), whose sum is σ = 74880. Its totient is φ = 28680.

The previous prime is 47419. The next prime is 47431. The reversal of 47421 is 12474.

It is a happy number.

It is not a de Polignac number, because 47421 - 2¹ = 47419 is a prime.

It is an Ulam number.

47421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 47394 and 47403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141 + ... + 338.

It is an arithmetic number, because the mean of its divisors is an integer number (6240).

2⁴⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

47421 is a deficient number, since it is larger than the sum of its proper divisors (27459).

47421 is a wasteful number, since it uses less digits than its factorization.

47421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 493 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 47421 is about 217.7636333275. The cubic root of 47421 is about 36.1956935548.

Adding to 47421 its reverse (12474), we get a palindrome (59895).

The spelling of 47421 in words is "forty-seven thousand, four hundred twenty-one", and thus it is an iban number.