73106021 has 2 divisors, whose sum is σ = 73106022. Its totient is φ = 73106020.

The previous prime is 73106017. The next prime is 73106023. The reversal of 73106021 is 12060137.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38130625 + 34975396 = 6175^2 + 5914^2 .

It is an emirp because it is prime and its reverse (12060137) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73106021 - 2² = 73106017 is a prime.

It is a Sophie Germain prime.

Together with 73106023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 73105984 and 73106002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73106023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36553010 + 36553011.

It is an arithmetic number, because the mean of its divisors is an integer number (36553011).

Almost surely, 2^73106021 is an apocalyptic number.

It is an amenable number.

73106021 is a deficient number, since it is larger than the sum of its proper divisors (1).

73106021 is an equidigital number, since it uses as much as digits as its factorization.

73106021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 73106021 is about 8550.2059039534. The cubic root of 73106021 is about 418.1361494938.

Adding to 73106021 its reverse (12060137), we get a palindrome (85166158).

It can be divided in two parts, 7310 and 6021, that added together give a palindrome (13331).

The spelling of 73106021 in words is "seventy-three million, one hundred six thousand, twenty-one".