123123211020 has 36 divisors (see below), whose sum is σ = 373473740640. Its totient is φ = 32832856224.

The previous prime is 123123210983. The next prime is 123123211033. The reversal of 123123211020 is 20112321321.

123123211020 is a `hidden beast` number, since 1 + 2 + 312 + 321 + 10 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123123210984 and 123123211002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 342008740 + ... + 342009099.

Almost surely, 2^123123211020 is an apocalyptic number.

123123211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123123211020 is an abundant number, since it is smaller than the sum of its proper divisors (250350529620).

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

123123211020 is a wasteful number, since it uses less digits than its factorization.

123123211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684017854 (or 684017849 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 123123211020 its reverse (20112321321), we get a palindrome (143235532341).

The spelling of 123123211020 in words is "one hundred twenty-three billion, one hundred twenty-three million, two hundred eleven thousand, twenty".