123100001020 has 24 divisors (see below), whose sum is σ = 260797706064. Its totient is φ = 48804247296.

The previous prime is 123100000987. The next prime is 123100001039. The reversal of 123100001020 is 20100001321.

It is a super-2 number, since 2×123100001020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 123100000988 and 123100001006.

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, 27232254 + ... + 27236773.

It is an arithmetic number, because the mean of its divisors is an integer number (10866571086).

Almost surely, 2^123100001020 is an apocalyptic number.

123100001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123100001020 is an abundant number, since it is smaller than the sum of its proper divisors (137697705044).

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

123100001020 is a wasteful number, since it uses less digits than its factorization.

123100001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54469149 (or 54469147 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 123100001020 its reverse (20100001321), we get a palindrome (143200002341).

The spelling of 123100001020 in words is "one hundred twenty-three billion, one hundred million, one thousand, twenty".