20012113123 has 2 divisors, whose sum is σ = 20012113124. Its totient is φ = 20012113122.

The previous prime is 20012113103. The next prime is 20012113133. The reversal of 20012113123 is 32131121002.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012113123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012113097 and 20012113106.

It is not a weakly prime, because it can be changed into another prime (20012113103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006056561 + 10006056562.

It is an arithmetic number, because the mean of its divisors is an integer number (10006056562).

Almost surely, 2^20012113123 is an apocalyptic number.

20012113123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012113123 is an equidigital number, since it uses as much as digits as its factorization.

20012113123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20012113123 its reverse (32131121002), we get a palindrome (52143234125).

The spelling of 20012113123 in words is "twenty billion, twelve million, one hundred thirteen thousand, one hundred twenty-three".