123211112100 has 72 divisors (see below), whose sum is σ = 364781340000. Its totient is φ = 32092193280.

The previous prime is 123211112077. The next prime is 123211112107. The reversal of 123211112100 is 1211112321.

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 123211112100.

It is not an unprimeable number, because it can be changed into a prime (123211112107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4762725 + ... + 4788524.

It is an arithmetic number, because the mean of its divisors is an integer number (5066407500).

Almost surely, 2^123211112100 is an apocalyptic number.

123211112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123211112100 is an abundant number, since it is smaller than the sum of its proper divisors (241570227900).

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

123211112100 is a wasteful number, since it uses less digits than its factorization.

123211112100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9551309 (or 9551302 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 123211112100 its reverse (1211112321), we get a palindrome (124422224421).

The spelling of 123211112100 in words is "one hundred twenty-three billion, two hundred eleven million, one hundred twelve thousand, one hundred".