100243121 has 4 divisors (see below), whose sum is σ = 109356144. Its totient is φ = 91130100.

The previous prime is 100243079. The next prime is 100243139. The reversal of 100243121 is 121342001.

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 100243121 - 2²² = 96048817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100243096 and 100243105.

It is not an unprimeable number, because it can be changed into a prime (100243321) 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, 4556495 + ... + 4556516.

It is an arithmetic number, because the mean of its divisors is an integer number (27339036).

Almost surely, 2^100243121 is an apocalyptic number.

100243121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100243121 is a deficient number, since it is larger than the sum of its proper divisors (9113023).

100243121 is an equidigital number, since it uses as much as digits as its factorization.

100243121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9113022.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 100243121 is about 10012.1486704903. The cubic root of 100243121 is about 464.5347348406.

Adding to 100243121 its reverse (121342001), we get a palindrome (221585122).

The spelling of 100243121 in words is "one hundred million, two hundred forty-three thousand, one hundred twenty-one".