30170221 has 2 divisors, whose sum is σ = 30170222. Its totient is φ = 30170220.

The previous prime is 30170213. The next prime is 30170249. The reversal of 30170221 is 12207103.

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., 28249225 + 1920996 = 5315^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 30170221 - 2³ = 30170213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30170195 and 30170204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30176221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15085110 + 15085111.

It is an arithmetic number, because the mean of its divisors is an integer number (15085111).

Almost surely, 2^30170221 is an apocalyptic number.

It is an amenable number.

30170221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30170221 is an equidigital number, since it uses as much as digits as its factorization.

30170221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 30170221 is about 5492.7425754353. The cubic root of 30170221 is about 311.3098272655.

Adding to 30170221 its reverse (12207103), we get a palindrome (42377324).

The spelling of 30170221 in words is "thirty million, one hundred seventy thousand, two hundred twenty-one".