30171221 has 4 divisors (see below), whose sum is σ = 31759200. Its totient is φ = 28583244.

The previous prime is 30171199. The next prime is 30171233. The reversal of 30171221 is 12217103.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12217103 = 769 ⋅15887.

It is a cyclic number.

It is not a de Polignac number, because 30171221 - 2⁶ = 30171157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30171221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30171241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 793961 + ... + 793998.

It is an arithmetic number, because the mean of its divisors is an integer number (7939800).

Almost surely, 2^30171221 is an apocalyptic number.

It is an amenable number.

30171221 is a deficient number, since it is larger than the sum of its proper divisors (1587979).

30171221 is a wasteful number, since it uses less digits than its factorization.

30171221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587978.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 30171221 is about 5492.8336038879. The cubic root of 30171221 is about 311.3132667099.

Adding to 30171221 its reverse (12217103), we get a palindrome (42388324).

The spelling of 30171221 in words is "thirty million, one hundred seventy-one thousand, two hundred twenty-one".