121210012123 has 2 divisors, whose sum is σ = 121210012124. Its totient is φ = 121210012122.

The previous prime is 121210012117. The next prime is 121210012151. The reversal of 121210012123 is 321210012121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121210012123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121210012097 and 121210012106.

It is not a weakly prime, because it can be changed into another prime (121210012423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605006061 + 60605006062.

It is an arithmetic number, because the mean of its divisors is an integer number (60605006062).

Almost surely, 2^121210012123 is an apocalyptic number.

121210012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210012123 is an equidigital number, since it uses as much as digits as its factorization.

121210012123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121210012123 its reverse (321210012121), we get a palindrome (442420024244).

The spelling of 121210012123 in words is "one hundred twenty-one billion, two hundred ten million, twelve thousand, one hundred twenty-three".