1121212423 has 2 divisors, whose sum is σ = 1121212424. Its totient is φ = 1121212422.

The previous prime is 1121212409. The next prime is 1121212429. The reversal of 1121212423 is 3242121211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121212423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1121212423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121212429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560606211 + 560606212.

It is an arithmetic number, because the mean of its divisors is an integer number (560606212).

Almost surely, 2^1121212423 is an apocalyptic number.

1121212423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121212423 is an equidigital number, since it uses as much as digits as its factorization.

1121212423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 1121212423 is about 33484.5101950141. The cubic root of 1121212423 is about 1038.8734173329.

Adding to 1121212423 its reverse (3242121211), we get a palindrome (4363333634).

The spelling of 1121212423 in words is "one billion, one hundred twenty-one million, two hundred twelve thousand, four hundred twenty-three".