73703380021 has 2 divisors, whose sum is σ = 73703380022. Its totient is φ = 73703380020.

The previous prime is 73703380019. The next prime is 73703380033. The reversal of 73703380021 is 12008330737.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49501355121 + 24202024900 = 222489^2 + 155570^2 .

It is a cyclic number.

It is not a de Polignac number, because 73703380021 - 2¹ = 73703380019 is a prime.

Together with 73703380019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73703380321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36851690010 + 36851690011.

It is an arithmetic number, because the mean of its divisors is an integer number (36851690011).

Almost surely, 2^73703380021 is an apocalyptic number.

It is an amenable number.

73703380021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73703380021 is an equidigital number, since it uses as much as digits as its factorization.

73703380021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 34.

The spelling of 73703380021 in words is "seventy-three billion, seven hundred three million, three hundred eighty thousand, twenty-one".