100312112121 has 32 divisors (see below), whose sum is σ = 152639061120. Its totient is φ = 58148160000.

The previous prime is 100312112113. The next prime is 100312112137. The reversal of 100312112121 is 121211213001.

It is not a de Polignac number, because 100312112121 - 2³ = 100312112113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100312112121.

It is not an unprimeable number, because it can be changed into a prime (100312112141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1035255 + ... + 1127996.

It is an arithmetic number, because the mean of its divisors is an integer number (4769970660).

Almost surely, 2^100312112121 is an apocalyptic number.

It is an amenable number.

100312112121 is a deficient number, since it is larger than the sum of its proper divisors (52326948999).

100312112121 is a wasteful number, since it uses less digits than its factorization.

100312112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163337.

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

Adding to 100312112121 its reverse (121211213001), we get a palindrome (221523325122).

The spelling of 100312112121 in words is "one hundred billion, three hundred twelve million, one hundred twelve thousand, one hundred twenty-one".