123031121100 has 72 divisors (see below), whose sum is σ = 358101746688. Its totient is φ = 32611828800.

The previous prime is 123031120991. The next prime is 123031121111. The reversal of 123031121100 is 1121130321.

It is a happy number.

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 123031121100.

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, 1177756 + ... + 1277955.

Almost surely, 2^123031121100 is an apocalyptic number.

123031121100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123031121100 is an abundant number, since it is smaller than the sum of its proper divisors (235070625588).

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

123031121100 is a wasteful number, since it uses less digits than its factorization.

123031121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455895 (or 2455888 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 123031121100 its reverse (1121130321), we get a palindrome (124152251421).

The spelling of 123031121100 in words is "one hundred twenty-three billion, thirty-one million, one hundred twenty-one thousand, one hundred".