173006021 has 2 divisors, whose sum is σ = 173006022. Its totient is φ = 173006020.

The previous prime is 173006003. The next prime is 173006047. The reversal of 173006021 is 120600371.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172922500 + 83521 = 13150^2 + 289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-173006021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 173005984 and 173006002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (173006321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86503010 + 86503011.

It is an arithmetic number, because the mean of its divisors is an integer number (86503011).

Almost surely, 2^173006021 is an apocalyptic number.

It is an amenable number.

173006021 is a deficient number, since it is larger than the sum of its proper divisors (1).

173006021 is an equidigital number, since it uses as much as digits as its factorization.

173006021 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 173006021 is about 13153.1753200510. The cubic root of 173006021 is about 557.2119297068.

Adding to 173006021 its reverse (120600371), we get a palindrome (293606392).

The spelling of 173006021 in words is "one hundred seventy-three million, six thousand, twenty-one".