100011121 has 4 divisors (see below), whose sum is σ = 114298432. Its totient is φ = 85723812.

The previous prime is 100011113. The next prime is 100011137. The reversal of 100011121 is 121110001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121110001 = 1291 ⋅93811.

It is a cyclic number.

It is not a de Polignac number, because 100011121 - 2³ = 100011113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7), and also a Moran number because the ratio is a prime number: 14287303 = 100011121 / (1 + 0 + 0 + 0 + 1 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100011161) 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, 7143645 + ... + 7143658.

It is an arithmetic number, because the mean of its divisors is an integer number (28574608).

Almost surely, 2^100011121 is an apocalyptic number.

It is an amenable number.

100011121 is a deficient number, since it is larger than the sum of its proper divisors (14287311).

100011121 is an equidigital number, since it uses as much as digits as its factorization.

100011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14287310.

The product of its (nonzero) digits is 2, while the sum is 7.

The square root of 100011121 is about 10000.5560345413. The cubic root of 100011121 is about 464.1760890933.

Adding to 100011121 its reverse (121110001), we get a palindrome (221121122).

It can be divided in two parts, 1000 and 11121, that added together give a palindrome (12121).

The spelling of 100011121 in words is "one hundred million, eleven thousand, one hundred twenty-one".