30261221 has 2 divisors, whose sum is σ = 30261222. Its totient is φ = 30261220.

The previous prime is 30261211. The next prime is 30261229. The reversal of 30261221 is 12216203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28408900 + 1852321 = 5330^2 + 1361^2 .

It is an emirp because it is prime and its reverse (12216203) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30261221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30261221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30261229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15130610 + 15130611.

It is an arithmetic number, because the mean of its divisors is an integer number (15130611).

Almost surely, 2^30261221 is an apocalyptic number.

It is an amenable number.

30261221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30261221 is an equidigital number, since it uses as much as digits as its factorization.

30261221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 30261221 is about 5501.0199963280. The cubic root of 30261221 is about 311.6225060000.

Adding to 30261221 its reverse (12216203), we get a palindrome (42477424).

The spelling of 30261221 in words is "thirty million, two hundred sixty-one thousand, two hundred twenty-one".