30211020173 has 2 divisors, whose sum is σ = 30211020174. Its totient is φ = 30211020172.

The previous prime is 30211020113. The next prime is 30211020241. The reversal of 30211020173 is 37102011203.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22632795364 + 7578224809 = 150442^2 + 87053^2 .

It is a cyclic number.

It is not a de Polignac number, because 30211020173 - 2¹⁸ = 30210758029 is a prime.

It is a super-4 number, since 4×30211020173⁴ (a number of 43 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30211020113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15105510086 + 15105510087.

It is an arithmetic number, because the mean of its divisors is an integer number (15105510087).

Almost surely, 2^30211020173 is an apocalyptic number.

It is an amenable number.

30211020173 is a deficient number, since it is larger than the sum of its proper divisors (1).

30211020173 is an equidigital number, since it uses as much as digits as its factorization.

30211020173 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.

Adding to 30211020173 its reverse (37102011203), we get a palindrome (67313031376).

The spelling of 30211020173 in words is "thirty billion, two hundred eleven million, twenty thousand, one hundred seventy-three".