30127221 has 10 divisors (see below), whose sum is σ = 45004982. Its totient is φ = 20084760.

The previous prime is 30127211. The next prime is 30127243. The reversal of 30127221 is 12272103.

It can be written as a sum of positive squares in only one way, i.e., 24860196 + 5267025 = 4986^2 + 2295^2 .

It is not a de Polignac number, because 30127221 - 2⁶ = 30127157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30127194 and 30127203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30127211) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 185890 + ... + 186051.

Almost surely, 2^30127221 is an apocalyptic number.

It is an amenable number.

30127221 is a deficient number, since it is larger than the sum of its proper divisors (14877761).

30127221 is an equidigital number, since it uses as much as digits as its factorization.

30127221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371953 (or 371944 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 30127221 is about 5488.8269238518. The cubic root of 30127221 is about 311.1618592055.

Adding to 30127221 its reverse (12272103), we get a palindrome (42399324).

The spelling of 30127221 in words is "thirty million, one hundred twenty-seven thousand, two hundred twenty-one".