100331312121 has 8 divisors (see below), whose sum is σ = 148638980960. Its totient is φ = 66887541396.

The previous prime is 100331312119. The next prime is 100331312129. The reversal of 100331312121 is 121213133001.

100331312121 is a `hidden beast` number, since 1 + 0 + 0 + 331 + 312 + 1 + 21 = 666.

It is not a de Polignac number, because 100331312121 - 2¹ = 100331312119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100331312094 and 100331312103.

It is not an unprimeable number, because it can be changed into a prime (100331312129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1857987235 + ... + 1857987288.

It is an arithmetic number, because the mean of its divisors is an integer number (18579872620).

Almost surely, 2^100331312121 is an apocalyptic number.

It is an amenable number.

100331312121 is a deficient number, since it is larger than the sum of its proper divisors (48307668839).

100331312121 is an equidigital number, since it uses as much as digits as its factorization.

100331312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715974532 (or 3715974526 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 100331312121 its reverse (121213133001), we get a palindrome (221544445122).

The spelling of 100331312121 in words is "one hundred billion, three hundred thirty-one million, three hundred twelve thousand, one hundred twenty-one".