54940021 has 2 divisors, whose sum is σ = 54940022. Its totient is φ = 54940020.

The previous prime is 54940003. The next prime is 54940057. The reversal of 54940021 is 12004945.

54940021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34644996 + 20295025 = 5886^2 + 4505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54940021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54940421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27470010 + 27470011.

It is an arithmetic number, because the mean of its divisors is an integer number (27470011).

Almost surely, 2^54940021 is an apocalyptic number.

It is an amenable number.

54940021 is a deficient number, since it is larger than the sum of its proper divisors (1).

54940021 is an equidigital number, since it uses as much as digits as its factorization.

54940021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 54940021 is about 7412.1536006750. The cubic root of 54940021 is about 380.1569550147.

Adding to 54940021 its reverse (12004945), we get a palindrome (66944966).

The spelling of 54940021 in words is "fifty-four million, nine hundred forty thousand, twenty-one".