53910591921 has 6 divisors (see below), whose sum is σ = 77870855010. Its totient is φ = 35940394608.

The previous prime is 53910591901. The next prime is 53910591929. The reversal of 53910591921 is 12919501935.

53910591921 is a `hidden beast` number, since 5 + 39 + 1 + 0 + 591 + 9 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 51118949025 + 2791642896 = 226095^2 + 52836^2 .

It is not a de Polignac number, because 53910591921 - 2⁷ = 53910591793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53910591929) 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 5 ways as a sum of consecutive naturals, for example, 2995032876 + ... + 2995032893.

It is an arithmetic number, because the mean of its divisors is an integer number (12978475835).

Almost surely, 2^53910591921 is an apocalyptic number.

It is an amenable number.

53910591921 is a deficient number, since it is larger than the sum of its proper divisors (23960263089).

53910591921 is a wasteful number, since it uses less digits than its factorization.

53910591921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5990065775 (or 5990065772 counting only the distinct ones).

The product of its (nonzero) digits is 109350, while the sum is 45.

The spelling of 53910591921 in words is "fifty-three billion, nine hundred ten million, five hundred ninety-one thousand, nine hundred twenty-one".