123321232100 has 144 divisors (see below), whose sum is σ = 310378884480. Its totient is φ = 42084556800.

The previous prime is 123321232079. The next prime is 123321232103. The reversal of 123321232100 is 1232123321.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (123321232103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1294916 + ... + 1386884.

It is an arithmetic number, because the mean of its divisors is an integer number (2155408920).

Almost surely, 2^123321232100 is an apocalyptic number.

123321232100 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 123321232100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155189442240).

123321232100 is an abundant number, since it is smaller than the sum of its proper divisors (187057652380).

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

123321232100 is a wasteful number, since it uses less digits than its factorization.

123321232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92070 (or 92063 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123321232100 its reverse (1232123321), we get a palindrome (124553355421).

The spelling of 123321232100 in words is "one hundred twenty-three billion, three hundred twenty-one million, two hundred thirty-two thousand, one hundred".