30311213123 has 4 divisors (see below), whose sum is σ = 30312400008. Its totient is φ = 30310026240.

The previous prime is 30311213117. The next prime is 30311213131. The reversal of 30311213123 is 32131211303.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30311213123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30311213095 and 30311213104.

It is not an unprimeable number, because it can be changed into a prime (30311213423) 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, 554273 + ... + 606498.

It is an arithmetic number, because the mean of its divisors is an integer number (7578100002).

Almost surely, 2^30311213123 is an apocalyptic number.

30311213123 is a deficient number, since it is larger than the sum of its proper divisors (1186885).

30311213123 is a wasteful number, since it uses less digits than its factorization.

30311213123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186884.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 30311213123 its reverse (32131211303), we get a palindrome (62442424426).

The spelling of 30311213123 in words is "thirty billion, three hundred eleven million, two hundred thirteen thousand, one hundred twenty-three".