54136021 has 4 divisors (see below), whose sum is σ = 54499500. Its totient is φ = 53772544.

The previous prime is 54135989. The next prime is 54136037. The reversal of 54136021 is 12063145.

54136021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12063145 = 5 ⋅2412629.

It can be written as a sum of positive squares in 2 ways, for example, as 16313521 + 37822500 = 4039^2 + 6150^2 .

It is a cyclic number.

It is not a de Polignac number, because 54136021 - 2⁵ = 54135989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 54135983 and 54136001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54136091) 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 in 3 ways as a sum of consecutive naturals, for example, 181516 + ... + 181813.

It is an arithmetic number, because the mean of its divisors is an integer number (13624875).

Almost surely, 2^54136021 is an apocalyptic number.

It is an amenable number.

54136021 is a deficient number, since it is larger than the sum of its proper divisors (363479).

54136021 is a wasteful number, since it uses less digits than its factorization.

54136021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363478.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 54136021 is about 7357.7184643067. The cubic root of 54136021 is about 378.2934113184.

Adding to 54136021 its reverse (12063145), we get a palindrome (66199166).

The spelling of 54136021 in words is "fifty-four million, one hundred thirty-six thousand, twenty-one".