21340302403997 has 2 divisors, whose sum is σ = 21340302403998. Its totient is φ = 21340302403996.

The previous prime is 21340302403963. The next prime is 21340302404053. The reversal of 21340302403997 is 79930420304312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21339540036676 + 762367321 = 4619474^2 + 27611^2 .

It is a cyclic number.

It is not a de Polignac number, because 21340302403997 - 2⁶ = 21340302403933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21340302403907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670151201998 + 10670151201999.

It is an arithmetic number, because the mean of its divisors is an integer number (10670151201999).

Almost surely, 2^{21340302403997} is an apocalyptic number.

It is an amenable number.

21340302403997 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340302403997 is an equidigital number, since it uses as much as digits as its factorization.

21340302403997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 47.

The spelling of 21340302403997 in words is "twenty-one trillion, three hundred forty billion, three hundred two million, four hundred three thousand, nine hundred ninety-seven".