100311232121 has 24 divisors (see below), whose sum is σ = 108714545280. Its totient is φ = 92505550592.

The previous prime is 100311232081. The next prime is 100311232129. The reversal of 100311232121 is 121232113001.

It is a de Polignac number, because none of the positive numbers 2^k-100311232121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100311232121.

It is not an unprimeable number, because it can be changed into a prime (100311232129) 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, 12663200 + ... + 12671118.

It is an arithmetic number, because the mean of its divisors is an integer number (4529772720).

Almost surely, 2^100311232121 is an apocalyptic number.

It is an amenable number.

100311232121 is a deficient number, since it is larger than the sum of its proper divisors (8403313159).

100311232121 is an equidigital number, since it uses as much as digits as its factorization.

100311232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8833 (or 8816 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 100311232121 its reverse (121232113001), we get a palindrome (221543345122).

The spelling of 100311232121 in words is "one hundred billion, three hundred eleven million, two hundred thirty-two thousand, one hundred twenty-one".