123001022100 has 144 divisors (see below), whose sum is σ = 391200961536. Its totient is φ = 29590704000.

The previous prime is 123001022087. The next prime is 123001022101. The reversal of 123001022100 is 1220100321.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123001022101) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 290037 + ... + 574563.

It is an arithmetic number, because the mean of its divisors is an integer number (2716673344).

Almost surely, 2^123001022100 is an apocalyptic number.

123001022100 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 123001022100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195600480768).

123001022100 is an abundant number, since it is smaller than the sum of its proper divisors (268199939436).

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

123001022100 is a wasteful number, since it uses less digits than its factorization.

123001022100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284686 (or 284679 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 123001022100 its reverse (1220100321), we get a palindrome (124221122421).

The spelling of 123001022100 in words is "one hundred twenty-three billion, one million, twenty-two thousand, one hundred".