30021142123 has 4 divisors (see below), whose sum is σ = 34309876720. Its totient is φ = 25732407528.

The previous prime is 30021142121. The next prime is 30021142153. The reversal of 30021142123 is 32124112003.

It is a happy number.

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 30021142123 - 2¹ = 30021142121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 30021142123.

It is not an unprimeable number, because it can be changed into a prime (30021142121) 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, 2144367288 + ... + 2144367301.

It is an arithmetic number, because the mean of its divisors is an integer number (8577469180).

Almost surely, 2^30021142123 is an apocalyptic number.

30021142123 is a deficient number, since it is larger than the sum of its proper divisors (4288734597).

30021142123 is an equidigital number, since it uses as much as digits as its factorization.

30021142123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4288734596.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 30021142123 its reverse (32124112003), we get a palindrome (62145254126).

The spelling of 30021142123 in words is "thirty billion, twenty-one million, one hundred forty-two thousand, one hundred twenty-three".