123111021212 has 24 divisors (see below), whose sum is σ = 223077540000. Its totient is φ = 59378469696.

The previous prime is 123111021197. The next prime is 123111021223. The reversal of 123111021212 is 212120111321.

It is a happy number.

It is a congruent number.

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, 358712 + ... + 612287.

It is an arithmetic number, because the mean of its divisors is an integer number (9294897500).

Almost surely, 2^123111021212 is an apocalyptic number.

It is an amenable number.

123111021212 is a deficient number, since it is larger than the sum of its proper divisors (99966518788).

123111021212 is a wasteful number, since it uses less digits than its factorization.

123111021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972125 (or 972123 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 123111021212 its reverse (212120111321), we get a palindrome (335231132533).

The spelling of 123111021212 in words is "one hundred twenty-three billion, one hundred eleven million, twenty-one thousand, two hundred twelve".