54204021 has 12 divisors (see below), whose sum is σ = 78358540. Its totient is φ = 36106560.

The previous prime is 54204013. The next prime is 54204049. The reversal of 54204021 is 12040245.

It can be written as a sum of positive squares in 2 ways, for example, as 3651921 + 50552100 = 1911^2 + 7110^2 .

It is not a de Polignac number, because 54204021 - 2³ = 54204013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 54203985 and 54204003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54206021) 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, 20241 + ... + 22761.

Almost surely, 2^54204021 is an apocalyptic number.

It is an amenable number.

54204021 is a deficient number, since it is larger than the sum of its proper divisors (24154519).

54204021 is a wasteful number, since it uses less digits than its factorization.

54204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4916 (or 4913 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 54204021 is about 7362.3380118003. The cubic root of 54204021 is about 378.4517359017.

Adding to 54204021 its reverse (12040245), we get a palindrome (66244266).

The spelling of 54204021 in words is "fifty-four million, two hundred four thousand, twenty-one".