68703440021 has 2 divisors, whose sum is σ = 68703440022. Its totient is φ = 68703440020.

The previous prime is 68703439999. The next prime is 68703440027. The reversal of 68703440021 is 12004430786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43008952996 + 25694487025 = 207386^2 + 160295^2 .

It is a cyclic number.

It is not a de Polignac number, because 68703440021 - 2²⁶ = 68636331157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68703440027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34351720010 + 34351720011.

It is an arithmetic number, because the mean of its divisors is an integer number (34351720011).

Almost surely, 2^68703440021 is an apocalyptic number.

It is an amenable number.

68703440021 is a deficient number, since it is larger than the sum of its proper divisors (1).

68703440021 is an equidigital number, since it uses as much as digits as its factorization.

68703440021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 68703440021 in words is "sixty-eight billion, seven hundred three million, four hundred forty thousand, twenty-one".