30021212123 has 4 divisors (see below), whose sum is σ = 34309956720. Its totient is φ = 25732467528.

The previous prime is 30021212099. The next prime is 30021212129. The reversal of 30021212123 is 32121212003.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30021212123 - 2⁸ = 30021211867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30021212129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144372288 + ... + 2144372301.

It is an arithmetic number, because the mean of its divisors is an integer number (8577489180).

Almost surely, 2^30021212123 is an apocalyptic number.

30021212123 is a deficient number, since it is larger than the sum of its proper divisors (4288744597).

30021212123 is an equidigital number, since it uses as much as digits as its factorization.

30021212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288744596.

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

Adding to 30021212123 its reverse (32121212003), we get a palindrome (62142424126).

The spelling of 30021212123 in words is "thirty billion, twenty-one million, two hundred twelve thousand, one hundred twenty-three".