12102121123 has 4 divisors (see below), whose sum is σ = 12307241880. Its totient is φ = 11897000368.

The previous prime is 12102121099. The next prime is 12102121127. The reversal of 12102121123 is 32112120121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12102121123 - 2¹⁷ = 12101990051 is a prime.

It is a super-2 number, since 2×12102121123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12102121097 and 12102121106.

It is not an unprimeable number, because it can be changed into a prime (12102121127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102560290 + ... + 102560407.

It is an arithmetic number, because the mean of its divisors is an integer number (3076810470).

Almost surely, 2^12102121123 is an apocalyptic number.

12102121123 is a deficient number, since it is larger than the sum of its proper divisors (205120757).

12102121123 is an equidigital number, since it uses as much as digits as its factorization.

12102121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205120756.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12102121123 its reverse (32112120121), we get a palindrome (44214241244).

It can be divided in two parts, 12102 and 121123, that added together give a square (133225 = 365²).

The spelling of 12102121123 in words is "twelve billion, one hundred two million, one hundred twenty-one thousand, one hundred twenty-three".