30222221 has 2 divisors, whose sum is σ = 30222222. Its totient is φ = 30222220.

The previous prime is 30222211. The next prime is 30222223. The reversal of 30222221 is 12222203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30096196 + 126025 = 5486^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 30222221 - 2²² = 26027917 is a prime.

Together with 30222223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 30222196 and 30222205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30222223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15111110 + 15111111.

It is an arithmetic number, because the mean of its divisors is an integer number (15111111).

Almost surely, 2^30222221 is an apocalyptic number.

It is an amenable number.

30222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30222221 is an equidigital number, since it uses as much as digits as its factorization.

30222221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 30222221 is about 5497.4740563281. The cubic root of 30222221 is about 311.4885776914.

Adding to 30222221 its reverse (12222203), we get a palindrome (42444424).

The spelling of 30222221 in words is "thirty million, two hundred twenty-two thousand, two hundred twenty-one".