54021 has 8 divisors (see below), whose sum is σ = 78624. Its totient is φ = 32720.

The previous prime is 54013. The next prime is 54037. The reversal of 54021 is 12045.

Added to its reverse (12045) it gives a triangular number (66066 = T₃₆₃).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 54021 - 2³ = 54013 is a prime.

It is a super-3 number, since 3×54021³ = 472943338353783, which contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 53988 and 54006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54001) 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, 786 + ... + 851.

It is an arithmetic number, because the mean of its divisors is an integer number (9828).

2⁵⁴⁰²¹ is an apocalyptic number.

It is an amenable number.

54021 is a deficient number, since it is larger than the sum of its proper divisors (24603).

54021 is a wasteful number, since it uses less digits than its factorization.

54021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 54021 is about 232.4241811860. The cubic root of 54021 is about 37.8025305548.

Adding to 54021 its reverse (12045), we get a palindrome (66066).

It can be divided in two parts, 540 and 21, that added together give a triangular number (561 = T₃₃).

The spelling of 54021 in words is "fifty-four thousand, twenty-one".