123011021100 has 72 divisors (see below), whose sum is σ = 388267524288. Its totient is φ = 29820852800.

The previous prime is 123011021093. The next prime is 123011021171. The reversal of 123011021100 is 1120110321.

It is a super-2 number, since 2×123011021100² (a number of 23 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18634734 + ... + 18641333.

It is an arithmetic number, because the mean of its divisors is an integer number (5392604504).

Almost surely, 2^123011021100 is an apocalyptic number.

123011021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123011021100 is an abundant number, since it is smaller than the sum of its proper divisors (265256503188).

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

123011021100 is a wasteful number, since it uses less digits than its factorization.

123011021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37276095 (or 37276088 counting only the distinct ones).

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

Adding to 123011021100 its reverse (1120110321), we get a palindrome (124131131421).

The spelling of 123011021100 in words is "one hundred twenty-three billion, eleven million, twenty-one thousand, one hundred".