53440823021 has 2 divisors, whose sum is σ = 53440823022. Its totient is φ = 53440823020.

The previous prime is 53440823017. The next prime is 53440823041. The reversal of 53440823021 is 12032804435.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52041015625 + 1399807396 = 228125^2 + 37414^2 .

It is a cyclic number.

It is not a de Polignac number, because 53440823021 - 2² = 53440823017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53440823041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26720411510 + 26720411511.

It is an arithmetic number, because the mean of its divisors is an integer number (26720411511).

Almost surely, 2^53440823021 is an apocalyptic number.

It is an amenable number.

53440823021 is a deficient number, since it is larger than the sum of its proper divisors (1).

53440823021 is an equidigital number, since it uses as much as digits as its factorization.

53440823021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 53440823021 in words is "fifty-three billion, four hundred forty million, eight hundred twenty-three thousand, twenty-one".