30198221 has 4 divisors (see below), whose sum is σ = 30365244. Its totient is φ = 30031200.

The previous prime is 30198211. The next prime is 30198257. The reversal of 30198221 is 12289103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12289103 = 431 ⋅28513.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 21114025 = 3014^2 + 4595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30198221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30198211) 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, 83240 + ... + 83601.

It is an arithmetic number, because the mean of its divisors is an integer number (7591311).

Almost surely, 2^30198221 is an apocalyptic number.

It is an amenable number.

30198221 is a deficient number, since it is larger than the sum of its proper divisors (167023).

30198221 is a wasteful number, since it uses less digits than its factorization.

30198221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167022.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 30198221 is about 5495.2908021323. The cubic root of 30198221 is about 311.4061029938.

The spelling of 30198221 in words is "thirty million, one hundred ninety-eight thousand, two hundred twenty-one".