123111123220 has 24 divisors (see below), whose sum is σ = 258610834944. Its totient is φ = 49229691936.

The previous prime is 123111123173. The next prime is 123111123241. The reversal of 123111123220 is 22321111321.

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, 853804 + ... + 987523.

It is an arithmetic number, because the mean of its divisors is an integer number (10775451456).

Almost surely, 2^123111123220 is an apocalyptic number.

123111123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123111123220 is an abundant number, since it is smaller than the sum of its proper divisors (135499711724).

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

123111123220 is a wasteful number, since it uses less digits than its factorization.

123111123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844679 (or 1844677 counting only the distinct ones).

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

Adding to 123111123220 its reverse (22321111321), we get a palindrome (145432234541).

The spelling of 123111123220 in words is "one hundred twenty-three billion, one hundred eleven million, one hundred twenty-three thousand, two hundred twenty".