100012121 has 4 divisors (see below), whose sum is σ = 109104144. Its totient is φ = 90920100.

The previous prime is 100012111. The next prime is 100012153. The reversal of 100012121 is 121210001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100012121 - 2⁶ = 100012057 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 = 100012099 and 100012108.

It is not an unprimeable number, because it can be changed into a prime (100012111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4545995 + ... + 4546016.

It is an arithmetic number, because the mean of its divisors is an integer number (27276036).

Almost surely, 2^100012121 is an apocalyptic number.

100012121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100012121 is a deficient number, since it is larger than the sum of its proper divisors (9092023).

100012121 is an equidigital number, since it uses as much as digits as its factorization.

100012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9092022.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 100012121 is about 10000.6060316363. The cubic root of 100012121 is about 464.1776361697.

Adding to 100012121 its reverse (121210001), we get a palindrome (221222122).

The spelling of 100012121 in words is "one hundred million, twelve thousand, one hundred twenty-one".