30111102221 has 2 divisors, whose sum is σ = 30111102222. Its totient is φ = 30111102220.

The previous prime is 30111102209. The next prime is 30111102251. The reversal of 30111102221 is 12220111103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29108113321 + 1002988900 = 170611^2 + 31670^2 .

It is an emirp because it is prime and its reverse (12220111103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30111102221 - 2⁶ = 30111102157 is a prime.

It is a super-2 number, since 2×30111102221² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30111102196 and 30111102205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30111102251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15055551110 + 15055551111.

It is an arithmetic number, because the mean of its divisors is an integer number (15055551111).

Almost surely, 2^30111102221 is an apocalyptic number.

It is an amenable number.

30111102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30111102221 is an equidigital number, since it uses as much as digits as its factorization.

30111102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 30111102221 its reverse (12220111103), we get a palindrome (42331213324).

The spelling of 30111102221 in words is "thirty billion, one hundred eleven million, one hundred two thousand, two hundred twenty-one".