54017021 has 4 divisors (see below), whose sum is σ = 54512700. Its totient is φ = 53521344.

The previous prime is 54016997. The next prime is 54017023. The reversal of 54017021 is 12071045.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43744996 + 10272025 = 6614^2 + 3205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54017021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 54016984 and 54017002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54017023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247676 + ... + 247893.

It is an arithmetic number, because the mean of its divisors is an integer number (13628175).

Almost surely, 2^54017021 is an apocalyptic number.

It is an amenable number.

54017021 is a deficient number, since it is larger than the sum of its proper divisors (495679).

54017021 is a wasteful number, since it uses less digits than its factorization.

54017021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495678.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 54017021 is about 7349.6272694607. The cubic root of 54017021 is about 378.0160239747.

Adding to 54017021 its reverse (12071045), we get a palindrome (66088066).

The spelling of 54017021 in words is "fifty-four million, seventeen thousand, twenty-one".