5380731266821 has 4 divisors (see below), whose sum is σ = 5380735925932. Its totient is φ = 5380726607712.

The previous prime is 5380731266809. The next prime is 5380731266839. The reversal of 5380731266821 is 1286621370835.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1459955057796 + 3920776209025 = 1208286^2 + 1980095^2 .

It is a cyclic number.

It is not a de Polignac number, because 5380731266821 - 2⁷ = 5380731266693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5380731266851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842731 + ... + 3386983.

It is an arithmetic number, because the mean of its divisors is an integer number (1345183981483).

Almost surely, 2^{5380731266821} is an apocalyptic number.

It is an amenable number.

5380731266821 is a deficient number, since it is larger than the sum of its proper divisors (4659111).

5380731266821 is a wasteful number, since it uses less digits than its factorization.

5380731266821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659110.

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 5380731266821 in words is "five trillion, three hundred eighty billion, seven hundred thirty-one million, two hundred sixty-six thousand, eight hundred twenty-one".