1211321123 has 2 divisors, whose sum is σ = 1211321124. Its totient is φ = 1211321122.

The previous prime is 1211321093. The next prime is 1211321149. The reversal of 1211321123 is 3211231121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211321123 - 2⁸ = 1211320867 is a prime.

It is a super-2 number, since 2×1211321123² = 2934597726051962258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211321183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605660561 + 605660562.

It is an arithmetic number, because the mean of its divisors is an integer number (605660562).

Almost surely, 2^1211321123 is an apocalyptic number.

1211321123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211321123 is an equidigital number, since it uses as much as digits as its factorization.

1211321123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 1211321123 is about 34804.0388891864. The cubic root of 1211321123 is about 1065.9899170902.

Adding to 1211321123 its reverse (3211231121), we get a palindrome (4422552244).

The spelling of 1211321123 in words is "one billion, two hundred eleven million, three hundred twenty-one thousand, one hundred twenty-three".