100403021 has 4 divisors (see below), whose sum is σ = 100672572. Its totient is φ = 100133472.

The previous prime is 100402999. The next prime is 100403029. The reversal of 100403021 is 120304001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30680521 + 69722500 = 5539^2 + 8350^2 .

It is a cyclic number.

It is not a de Polignac number, because 100403021 - 2⁶ = 100402957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100402993 and 100403011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100403029) 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, 134216 + ... + 134961.

It is an arithmetic number, because the mean of its divisors is an integer number (25168143).

Almost surely, 2^100403021 is an apocalyptic number.

It is an amenable number.

100403021 is a deficient number, since it is larger than the sum of its proper divisors (269551).

100403021 is an equidigital number, since it uses as much as digits as its factorization.

100403021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269550.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 100403021 is about 10020.1307875696. The cubic root of 100403021 is about 464.7816001403.

Adding to 100403021 its reverse (120304001), we get a palindrome (220707022).

The spelling of 100403021 in words is "one hundred million, four hundred three thousand, twenty-one".