123221002100 has 144 divisors (see below), whose sum is σ = 329153932800. Its totient is φ = 39092699520.

The previous prime is 123221002039. The next prime is 123221002123. The reversal of 123221002100 is 1200122321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 464171 + ... + 679629.

It is an arithmetic number, because the mean of its divisors is an integer number (2285791200).

Almost surely, 2^123221002100 is an apocalyptic number.

123221002100 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 123221002100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164576966400).

123221002100 is an abundant number, since it is smaller than the sum of its proper divisors (205932930700).

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

123221002100 is a wasteful number, since it uses less digits than its factorization.

123221002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215542 (or 215535 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 123221002100 its reverse (1200122321), we get a palindrome (124421124421).

The spelling of 123221002100 in words is "one hundred twenty-three billion, two hundred twenty-one million, two thousand, one hundred".