123311212120 has 32 divisors (see below), whose sum is σ = 278325493200. Its totient is φ = 49168882048.

The previous prime is 123311212111. The next prime is 123311212139. The reversal of 123311212120 is 21212113321.

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, 4849750 + ... + 4875109.

Almost surely, 2^123311212120 is an apocalyptic number.

123311212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123311212120 is an abundant number, since it is smaller than the sum of its proper divisors (155014281080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123311212120 is a wasteful number, since it uses less digits than its factorization.

123311212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9725187 (or 9725183 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 123311212120 its reverse (21212113321), we get a palindrome (144523325441).

The spelling of 123311212120 in words is "one hundred twenty-three billion, three hundred eleven million, two hundred twelve thousand, one hundred twenty".