123121121311 has 2 divisors, whose sum is σ = 123121121312. Its totient is φ = 123121121310.

The previous prime is 123121121309. The next prime is 123121121329. The reversal of 123121121311 is 113121121321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123121121311 - 2¹ = 123121121309 is a prime.

Together with 123121121309, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123121121341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560560655 + 61560560656.

It is an arithmetic number, because the mean of its divisors is an integer number (61560560656).

Almost surely, 2^123121121311 is an apocalyptic number.

123121121311 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121121311 is an equidigital number, since it uses as much as digits as its factorization.

123121121311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

Adding to 123121121311 its reverse (113121121321), we get a palindrome (236242242632).

The spelling of 123121121311 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred twenty-one thousand, three hundred eleven".