30100042123 has 4 divisors (see below), whose sum is σ = 31137974640. Its totient is φ = 29062109608.

The previous prime is 30100042099. The next prime is 30100042127. The reversal of 30100042123 is 32124000103.

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 30100042123 - 2²¹ = 30097944971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30100042097 and 30100042106.

It is not an unprimeable number, because it can be changed into a prime (30100042127) 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, 518966215 + ... + 518966272.

It is an arithmetic number, because the mean of its divisors is an integer number (7784493660).

Almost surely, 2^30100042123 is an apocalyptic number.

30100042123 is a deficient number, since it is larger than the sum of its proper divisors (1037932517).

30100042123 is a wasteful number, since it uses less digits than its factorization.

30100042123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037932516.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 30100042123 its reverse (32124000103), we get a palindrome (62224042226).

The spelling of 30100042123 in words is "thirty billion, one hundred million, forty-two thousand, one hundred twenty-three".