30221309 has 4 divisors (see below), whose sum is σ = 30238560. Its totient is φ = 30204060.

The previous prime is 30221281. The next prime is 30221351. The reversal of 30221309 is 90312203.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30221309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30221369) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5657 + ... + 9614.

It is an arithmetic number, because the mean of its divisors is an integer number (7559640).

Almost surely, 2^30221309 is an apocalyptic number.

It is an amenable number.

30221309 is a deficient number, since it is larger than the sum of its proper divisors (17251).

30221309 is a wasteful number, since it uses less digits than its factorization.

30221309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17250.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 30221309 is about 5497.3911085168. The cubic root of 30221309 is about 311.4854444511.

The spelling of 30221309 in words is "thirty million, two hundred twenty-one thousand, three hundred nine".