53123921 has 2 divisors, whose sum is σ = 53123922. Its totient is φ = 53123920.

The previous prime is 53123887. The next prime is 53123923. The reversal of 53123921 is 12932135.

53123921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 19018321 = 5840^2 + 4361^2 .

It is a cyclic number.

It is not a de Polignac number, because 53123921 - 2⁶ = 53123857 is a prime.

Together with 53123923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (53123923) 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, 26561960 + 26561961.

It is an arithmetic number, because the mean of its divisors is an integer number (26561961).

Almost surely, 2^53123921 is an apocalyptic number.

It is an amenable number.

53123921 is a deficient number, since it is larger than the sum of its proper divisors (1).

53123921 is an equidigital number, since it uses as much as digits as its factorization.

53123921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 26.

The square root of 53123921 is about 7288.6158493914. The cubic root of 53123921 is about 375.9211039572.

The spelling of 53123921 in words is "fifty-three million, one hundred twenty-three thousand, nine hundred twenty-one".