10405967821 has 2 divisors, whose sum is σ = 10405967822. Its totient is φ = 10405967820.

The previous prime is 10405967807. The next prime is 10405967863. The reversal of 10405967821 is 12876950401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8278452196 + 2127515625 = 90986^2 + 46125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10405967821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10405997821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5202983910 + 5202983911.

It is an arithmetic number, because the mean of its divisors is an integer number (5202983911).

Almost surely, 2^10405967821 is an apocalyptic number.

It is an amenable number.

10405967821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10405967821 is an equidigital number, since it uses as much as digits as its factorization.

10405967821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 10405967821 in words is "ten billion, four hundred five million, nine hundred sixty-seven thousand, eight hundred twenty-one".