54210521 has 4 divisors (see below), whose sum is σ = 54574500. Its totient is φ = 53846544.

The previous prime is 54210493. The next prime is 54210529. The reversal of 54210521 is 12501245.

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 1792921 + 52417600 = 1339^2 + 7240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54210521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 54210493 and 54210502.

It is not an unprimeable number, because it can be changed into a prime (54210529) 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, 181766 + ... + 182063.

It is an arithmetic number, because the mean of its divisors is an integer number (13643625).

Almost surely, 2^54210521 is an apocalyptic number.

It is an amenable number.

54210521 is a deficient number, since it is larger than the sum of its proper divisors (363979).

54210521 is a wasteful number, since it uses less digits than its factorization.

54210521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363978.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 54210521 is about 7362.7794344256. The cubic root of 54210521 is about 378.4668629342.

Adding to 54210521 its reverse (12501245), we get a palindrome (66711766).

The spelling of 54210521 in words is "fifty-four million, two hundred ten thousand, five hundred twenty-one".