1212133123 has 2 divisors, whose sum is σ = 1212133124. Its totient is φ = 1212133122.

The previous prime is 1212133067. The next prime is 1212133147. The reversal of 1212133123 is 3213312121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212133123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212133123.

It is not a weakly prime, because it can be changed into another prime (1212133163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606066561 + 606066562.

It is an arithmetic number, because the mean of its divisors is an integer number (606066562).

Almost surely, 2^1212133123 is an apocalyptic number.

1212133123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212133123 is an equidigital number, since it uses as much as digits as its factorization.

1212133123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 1212133123 is about 34815.7022476928. The cubic root of 1212133123 is about 1066.2280566597.

Adding to 1212133123 its reverse (3213312121), we get a palindrome (4425445244).

The spelling of 1212133123 in words is "one billion, two hundred twelve million, one hundred thirty-three thousand, one hundred twenty-three".