123121230100 has 144 divisors (see below), whose sum is σ = 313215577920. Its totient is φ = 41508403200.

The previous prime is 123121230091. The next prime is 123121230121. The reversal of 123121230100 is 1032121321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1203766 + ... + 1302034.

It is an arithmetic number, because the mean of its divisors is an integer number (2175108180).

Almost surely, 2^123121230100 is an apocalyptic number.

123121230100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123121230100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156607788960).

123121230100 is an abundant number, since it is smaller than the sum of its proper divisors (190094347820).

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

123121230100 is a wasteful number, since it uses less digits than its factorization.

123121230100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98378 (or 98371 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 123121230100 its reverse (1032121321), we get a palindrome (124153351421).

The spelling of 123121230100 in words is "one hundred twenty-three billion, one hundred twenty-one million, two hundred thirty thousand, one hundred".