54105021 has 12 divisors (see below), whose sum is σ = 78222300. Its totient is φ = 36037440.

The previous prime is 54105019. The next prime is 54105031. The reversal of 54105021 is 12050145.

It can be written as a sum of positive squares in 2 ways, for example, as 26163225 + 27941796 = 5115^2 + 5286^2 .

It is not a de Polignac number, because 54105021 - 2¹ = 54105019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 54104985 and 54105003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54105001) 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, 12001 + ... + 15881.

It is an arithmetic number, because the mean of its divisors is an integer number (6518525).

Almost surely, 2^54105021 is an apocalyptic number.

It is an amenable number.

54105021 is a deficient number, since it is larger than the sum of its proper divisors (24117279).

54105021 is a wasteful number, since it uses less digits than its factorization.

54105021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5436 (or 5433 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 54105021 is about 7355.6115313412. The cubic root of 54105021 is about 378.2211899355.

Adding to 54105021 its reverse (12050145), we get a palindrome (66155166).

The spelling of 54105021 in words is "fifty-four million, one hundred five thousand, twenty-one".