12123405551 has 4 divisors (see below), whose sum is σ = 12836547072. Its totient is φ = 11410264032.

The previous prime is 12123405479. The next prime is 12123405557. The reversal of 12123405551 is 15550432121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15550432121 = 7 ⋅2221490303.

It is a cyclic number.

It is not a de Polignac number, because 12123405551 - 2¹⁴ = 12123389167 is a prime.

It is a super-2 number, since 2×12123405551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123405557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356570735 + ... + 356570768.

It is an arithmetic number, because the mean of its divisors is an integer number (3209136768).

Almost surely, 2^12123405551 is an apocalyptic number.

12123405551 is a deficient number, since it is larger than the sum of its proper divisors (713141521).

12123405551 is an equidigital number, since it uses as much as digits as its factorization.

12123405551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713141520.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 12123405551 its reverse (15550432121), we get a palindrome (27673837672).

The spelling of 12123405551 in words is "twelve billion, one hundred twenty-three million, four hundred five thousand, five hundred fifty-one".