123112020030 has 64 divisors (see below), whose sum is σ = 305867016000. Its totient is φ = 31676072960.

The previous prime is 123112020011. The next prime is 123112020043. The reversal of 123112020030 is 30020211321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a junction number, because it is equal to n+sod(n) for n = 123112019991 and 123112020009.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1240696 + ... + 1336244.

It is an arithmetic number, because the mean of its divisors is an integer number (4779172125).

Almost surely, 2^123112020030 is an apocalyptic number.

123112020030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123112020030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152933508000).

123112020030 is an abundant number, since it is smaller than the sum of its proper divisors (182754995970).

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

123112020030 is a wasteful number, since it uses less digits than its factorization.

123112020030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97069.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 123112020030 its reverse (30020211321), we get a palindrome (153132231351).

The spelling of 123112020030 in words is "one hundred twenty-three billion, one hundred twelve million, twenty thousand, thirty".