30121212113 has 4 divisors (see below), whose sum is σ = 30127378020. Its totient is φ = 30115046208.

The previous prime is 30121212103. The next prime is 30121212133. The reversal of 30121212113 is 31121212103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31121212103 = 47 ⋅662153449.

It can be written as a sum of positive squares in 2 ways, for example, as 9110129809 + 21011082304 = 95447^2 + 144952^2 .

It is a cyclic number.

It is not a de Polignac number, because 30121212113 - 2⁶ = 30121212049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30121212091 and 30121212100.

It is not an unprimeable number, because it can be changed into a prime (30121212103) 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 in 3 ways as a sum of consecutive naturals, for example, 3075620 + ... + 3085397.

It is an arithmetic number, because the mean of its divisors is an integer number (7531844505).

Almost surely, 2^30121212113 is an apocalyptic number.

It is an amenable number.

30121212113 is a deficient number, since it is larger than the sum of its proper divisors (6165907).

30121212113 is an equidigital number, since it uses as much as digits as its factorization.

30121212113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6165906.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 30121212113 its reverse (31121212103), we get a palindrome (61242424216).

The spelling of 30121212113 in words is "thirty billion, one hundred twenty-one million, two hundred twelve thousand, one hundred thirteen".