403400040821 has 2 divisors, whose sum is σ = 403400040822. Its totient is φ = 403400040820.

The previous prime is 403400040707. The next prime is 403400040847. The reversal of 403400040821 is 128040004304.

It is an a-pointer prime, because the next prime (403400040847) can be obtained adding 403400040821 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350493600625 + 52906440196 = 592025^2 + 230014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-403400040821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403400040221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201700020410 + 201700020411.

It is an arithmetic number, because the mean of its divisors is an integer number (201700020411).

Almost surely, 2^403400040821 is an apocalyptic number.

It is an amenable number.

403400040821 is a deficient number, since it is larger than the sum of its proper divisors (1).

403400040821 is an equidigital number, since it uses as much as digits as its factorization.

403400040821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 26.

The spelling of 403400040821 in words is "four hundred three billion, four hundred million, forty thousand, eight hundred twenty-one".