30121233221 has 2 divisors, whose sum is σ = 30121233222. Its totient is φ = 30121233220.

The previous prime is 30121233211. The next prime is 30121233253. The reversal of 30121233221 is 12233212103.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16049342596 + 14071890625 = 126686^2 + 118625^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121233221 - 2⁶ = 30121233157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 30121233193 and 30121233202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30121233211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060616610 + 15060616611.

It is an arithmetic number, because the mean of its divisors is an integer number (15060616611).

Almost surely, 2^30121233221 is an apocalyptic number.

It is an amenable number.

30121233221 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121233221 is an equidigital number, since it uses as much as digits as its factorization.

30121233221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 30121233221 its reverse (12233212103), we get a palindrome (42354445324).

It can be divided in two parts, 301212 and 33221, that added together give a palindrome (334433).

The spelling of 30121233221 in words is "thirty billion, one hundred twenty-one million, two hundred thirty-three thousand, two hundred twenty-one".