12123211012 has 12 divisors (see below), whose sum is σ = 23144312016. Its totient is φ = 5510550440.

The previous prime is 12123211007. The next prime is 12123211033. The reversal of 12123211012 is 21011232121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137763718 + ... + 137763805.

It is an arithmetic number, because the mean of its divisors is an integer number (1928692668).

Almost surely, 2^12123211012 is an apocalyptic number.

It is an amenable number.

12123211012 is a deficient number, since it is larger than the sum of its proper divisors (11021101004).

12123211012 is a wasteful number, since it uses less digits than its factorization.

12123211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275527538 (or 275527536 counting only the distinct ones).

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

Adding to 12123211012 its reverse (21011232121), we get a palindrome (33134443133).

The spelling of 12123211012 in words is "twelve billion, one hundred twenty-three million, two hundred eleven thousand, twelve".