212121122123 has 2 divisors, whose sum is σ = 212121122124. Its totient is φ = 212121122122.

The previous prime is 212121122053. The next prime is 212121122141. The reversal of 212121122123 is 321221121212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212121122123 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 212121122095 and 212121122104.

It is not a weakly prime, because it can be changed into another prime (212121112123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060561061 + 106060561062.

It is an arithmetic number, because the mean of its divisors is an integer number (106060561062).

Almost surely, 2^212121122123 is an apocalyptic number.

212121122123 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121122123 is an equidigital number, since it uses as much as digits as its factorization.

212121122123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 20.

Adding to 212121122123 its reverse (321221121212), we get a palindrome (533342243335).

The spelling of 212121122123 in words is "two hundred twelve billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-three".