100403121 has 16 divisors (see below), whose sum is σ = 164764544. Its totient is φ = 52959744.

The previous prime is 100403113. The next prime is 100403123. The reversal of 100403121 is 121304001.

It is a happy number.

It is not a de Polignac number, because 100403121 - 2³ = 100403113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100403097 and 100403106.

It is not an unprimeable number, because it can be changed into a prime (100403123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183616 + ... + 184161.

It is an arithmetic number, because the mean of its divisors is an integer number (10297784).

Almost surely, 2^100403121 is an apocalyptic number.

It is an amenable number.

100403121 is a deficient number, since it is larger than the sum of its proper divisors (64361423).

100403121 is a wasteful number, since it uses less digits than its factorization.

100403121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367800.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 100403121 is about 10020.1357775232. The cubic root of 100403121 is about 464.7817544456.

Adding to 100403121 its reverse (121304001), we get a palindrome (221707122).

The spelling of 100403121 in words is "one hundred million, four hundred three thousand, one hundred twenty-one".