123212102100 has 72 divisors (see below), whose sum is σ = 357383042688. Its totient is φ = 32774592000.

The previous prime is 123212102099. The next prime is 123212102161. The reversal of 123212102100 is 1201212321.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 123212102100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 391804 + ... + 632403.

Almost surely, 2^123212102100 is an apocalyptic number.

123212102100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123212102100 is an abundant number, since it is smaller than the sum of its proper divisors (234170940588).

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

123212102100 is a wasteful number, since it uses less digits than its factorization.

123212102100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024625 (or 1024618 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 123212102100 its reverse (1201212321), we get a palindrome (124413314421).

The spelling of 123212102100 in words is "one hundred twenty-three billion, two hundred twelve million, one hundred two thousand, one hundred".