12023121555 has 24 divisors (see below), whose sum is σ = 20858273280. Its totient is φ = 6406732800.

The previous prime is 12023121541. The next prime is 12023121557. The reversal of 12023121555 is 55512132021.

It is not a de Polignac number, because 12023121555 - 2¹³ = 12023113363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12023121557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64270 + ... + 167859.

It is an arithmetic number, because the mean of its divisors is an integer number (869094720).

Almost surely, 2^12023121555 is an apocalyptic number.

12023121555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12023121555 is a deficient number, since it is larger than the sum of its proper divisors (8835151725).

12023121555 is a wasteful number, since it uses less digits than its factorization.

12023121555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233291 (or 233288 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 12023121555 its reverse (55512132021), we get a palindrome (67535253576).

The spelling of 12023121555 in words is "twelve billion, twenty-three million, one hundred twenty-one thousand, five hundred fifty-five".