30121211123 has 4 divisors (see below), whose sum is σ = 30123692880. Its totient is φ = 30118729368.

The previous prime is 30121211093. The next prime is 30121211143. The reversal of 30121211123 is 32111212103.

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 30121211123 - 2¹² = 30121207027 is a prime.

It is a super-2 number, since 2×30121211123² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30121211143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1222583 + ... + 1246976.

It is an arithmetic number, because the mean of its divisors is an integer number (7530923220).

Almost surely, 2^30121211123 is an apocalyptic number.

30121211123 is a deficient number, since it is larger than the sum of its proper divisors (2481757).

30121211123 is a wasteful number, since it uses less digits than its factorization.

30121211123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481756.

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

Adding to 30121211123 its reverse (32111212103), we get a palindrome (62232423226).

The spelling of 30121211123 in words is "thirty billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-three".