123121423100 has 72 divisors (see below), whose sum is σ = 302868792240. Its totient is φ = 43067566080.

The previous prime is 123121423069. The next prime is 123121423129. The reversal of 123121423100 is 1324121321.

It is a super-2 number, since 2×123121423100² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

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, 2467637 + ... + 2517036.

Almost surely, 2^123121423100 is an apocalyptic number.

123121423100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121423100 is an abundant number, since it is smaller than the sum of its proper divisors (179747369140).

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

123121423100 is a wasteful number, since it uses less digits than its factorization.

123121423100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4984719 (or 4984712 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 123121423100 its reverse (1324121321), we get a palindrome (124445544421).

The spelling of 123121423100 in words is "one hundred twenty-three billion, one hundred twenty-one million, four hundred twenty-three thousand, one hundred".