121231312454111 has 2 divisors, whose sum is σ = 121231312454112. Its totient is φ = 121231312454110.

The previous prime is 121231312454093. The next prime is 121231312454179. The reversal of 121231312454111 is 111454213132121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121231312454111 - 2³⁰ = 121230238712287 is a prime.

It is a super-2 number, since 2×121231312454111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121231312454711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60615656227055 + 60615656227056.

It is an arithmetic number, because the mean of its divisors is an integer number (60615656227056).

Almost surely, 2^{121231312454111} is an apocalyptic number.

121231312454111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121231312454111 is an equidigital number, since it uses as much as digits as its factorization.

121231312454111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 32.

Adding to 121231312454111 its reverse (111454213132121), we get a palindrome (232685525586232).

The spelling of 121231312454111 in words is "one hundred twenty-one trillion, two hundred thirty-one billion, three hundred twelve million, four hundred fifty-four thousand, one hundred eleven".