30121312123 has 16 divisors (see below), whose sum is σ = 36367025920. Its totient is φ = 24371080416.

The previous prime is 30121312121. The next prime is 30121312139. The reversal of 30121312123 is 32121312103.

It is a cyclic number.

It is not a de Polignac number, because 30121312123 - 2¹ = 30121312121 is a prime.

It is a super-2 number, since 2×30121312123² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30121312123.

It is not an unprimeable number, because it can be changed into a prime (30121312121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371961 + ... + 445642.

It is an arithmetic number, because the mean of its divisors is an integer number (2272939120).

Almost surely, 2^30121312123 is an apocalyptic number.

30121312123 is a deficient number, since it is larger than the sum of its proper divisors (6245713797).

30121312123 is a wasteful number, since it uses less digits than its factorization.

30121312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817906.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 30121312123 its reverse (32121312103), we get a palindrome (62242624226).

The spelling of 30121312123 in words is "thirty billion, one hundred twenty-one million, three hundred twelve thousand, one hundred twenty-three".