30213221 has 4 divisors (see below), whose sum is σ = 30322572. Its totient is φ = 30103872.

The previous prime is 30213217. The next prime is 30213247. The reversal of 30213221 is 12231203.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4060225 + 26152996 = 2015^2 + 5114^2 .

It is a cyclic number.

It is not a de Polignac number, because 30213221 - 2² = 30213217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30213196 and 30213205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30210221) 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, 54260 + ... + 54813.

It is an arithmetic number, because the mean of its divisors is an integer number (7580643).

Almost surely, 2^30213221 is an apocalyptic number.

It is an amenable number.

30213221 is a deficient number, since it is larger than the sum of its proper divisors (109351).

30213221 is a wasteful number, since it uses less digits than its factorization.

30213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109350.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 30213221 is about 5496.6554376275. The cubic root of 30213221 is about 311.4576547983.

Adding to 30213221 its reverse (12231203), we get a palindrome (42444424).

The spelling of 30213221 in words is "thirty million, two hundred thirteen thousand, two hundred twenty-one".