1213155121423 has 16 divisors (see below), whose sum is σ = 1428126073920. Its totient is φ = 1008880185600.

The previous prime is 1213155121333. The next prime is 1213155121459. The reversal of 1213155121423 is 3241215513121.

It is not a de Polignac number, because 1213155121423 - 2²⁹ = 1212618250511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213155121483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11624908 + ... + 11728801.

It is an arithmetic number, because the mean of its divisors is an integer number (89257879620).

Almost surely, 2^{1213155121423} is an apocalyptic number.

1213155121423 is a deficient number, since it is larger than the sum of its proper divisors (214970952497).

1213155121423 is a wasteful number, since it uses less digits than its factorization.

1213155121423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23353938.

The product of its digits is 7200, while the sum is 31.

The spelling of 1213155121423 in words is "one trillion, two hundred thirteen billion, one hundred fifty-five million, one hundred twenty-one thousand, four hundred twenty-three".