100012321121 has 4 divisors (see below), whose sum is σ = 105895398852. Its totient is φ = 94129243392.

The previous prime is 100012321109. The next prime is 100012321153. The reversal of 100012321121 is 121123210001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121123210001 = 127 ⋅953726063.

It can be written as a sum of positive squares in 2 ways, for example, as 55430110096 + 44582211025 = 235436^2 + 211145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100012321121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100012321096 and 100012321105.

It is not an unprimeable number, because it can be changed into a prime (100012324121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2941538840 + ... + 2941538873.

It is an arithmetic number, because the mean of its divisors is an integer number (26473849713).

Almost surely, 2^100012321121 is an apocalyptic number.

It is an amenable number.

100012321121 is a deficient number, since it is larger than the sum of its proper divisors (5883077731).

100012321121 is an equidigital number, since it uses as much as digits as its factorization.

100012321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883077730.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 100012321121 its reverse (121123210001), we get a palindrome (221135531122).

The spelling of 100012321121 in words is "one hundred billion, twelve million, three hundred twenty-one thousand, one hundred twenty-one".