53338817821 has 2 divisors, whose sum is σ = 53338817822. Its totient is φ = 53338817820.

The previous prime is 53338817813. The next prime is 53338817843. The reversal of 53338817821 is 12871883335.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52684020900 + 654796921 = 229530^2 + 25589^2 .

It is a cyclic number.

It is not a de Polignac number, because 53338817821 - 2³ = 53338817813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53338814821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26669408910 + 26669408911.

It is an arithmetic number, because the mean of its divisors is an integer number (26669408911).

Almost surely, 2^53338817821 is an apocalyptic number.

It is an amenable number.

53338817821 is a deficient number, since it is larger than the sum of its proper divisors (1).

53338817821 is an equidigital number, since it uses as much as digits as its factorization.

53338817821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 49.

The spelling of 53338817821 in words is "fifty-three billion, three hundred thirty-eight million, eight hundred seventeen thousand, eight hundred twenty-one".