20121123212 has 24 divisors (see below), whose sum is σ = 36823397856. Its totient is φ = 9602068608.

The previous prime is 20121123203. The next prime is 20121123227. The reversal of 20121123212 is 21232112102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197243 + ... + 281330.

It is an arithmetic number, because the mean of its divisors is an integer number (1534308244).

Almost surely, 2^20121123212 is an apocalyptic number.

It is an amenable number.

20121123212 is a deficient number, since it is larger than the sum of its proper divisors (16702274644).

20121123212 is a wasteful number, since it uses less digits than its factorization.

20121123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479057 (or 479055 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 20121123212 its reverse (21232112102), we get a palindrome (41353235314).

The spelling of 20121123212 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twelve".