53115276821 has 2 divisors, whose sum is σ = 53115276822. Its totient is φ = 53115276820.

The previous prime is 53115276679. The next prime is 53115276829. The reversal of 53115276821 is 12867251135.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39061174321 + 14054102500 = 197639^2 + 118550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53115276821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53115276829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26557638410 + 26557638411.

It is an arithmetic number, because the mean of its divisors is an integer number (26557638411).

Almost surely, 2^53115276821 is an apocalyptic number.

It is an amenable number.

53115276821 is a deficient number, since it is larger than the sum of its proper divisors (1).

53115276821 is an equidigital number, since it uses as much as digits as its factorization.

53115276821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The spelling of 53115276821 in words is "fifty-three billion, one hundred fifteen million, two hundred seventy-six thousand, eight hundred twenty-one".