30121121 has 4 divisors (see below), whose sum is σ = 30132144. Its totient is φ = 30110100.

The previous prime is 30121097. The next prime is 30121151. The reversal of 30121121 is 12112103.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 30121121 - 2¹⁸ = 29858977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30121151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006 + ... + 8016.

It is an arithmetic number, because the mean of its divisors is an integer number (7533036).

Almost surely, 2^30121121 is an apocalyptic number.

It is an amenable number.

30121121 is a deficient number, since it is larger than the sum of its proper divisors (11023).

30121121 is an equidigital number, since it uses as much as digits as its factorization.

30121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11022.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 30121121 is about 5488.2712214321. The cubic root of 30121121 is about 311.1408569867.

Adding to 30121121 its reverse (12112103), we get a palindrome (42233224).

The spelling of 30121121 in words is "thirty million, one hundred twenty-one thousand, one hundred twenty-one".