100430021 has 6 divisors (see below), whose sum is σ = 100926150. Its totient is φ = 99936296.

The previous prime is 100429981. The next prime is 100430039. The reversal of 100430021 is 120034001.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 95277121 + 5152900 = 9761^2 + 2270^2 .

It is not a de Polignac number, because 100430021 - 2¹⁸ = 100167877 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 = 100429984 and 100430011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100430051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50555 + ... + 52503.

It is an arithmetic number, because the mean of its divisors is an integer number (16821025).

Almost surely, 2^100430021 is an apocalyptic number.

It is an amenable number.

100430021 is a deficient number, since it is larger than the sum of its proper divisors (496129).

100430021 is an frugal number, since it uses more digits than its factorization.

100430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403 (or 2176 counting only the distinct ones).

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

The square root of 100430021 is about 10021.4779848084. The cubic root of 100430021 is about 464.8232588419.

Adding to 100430021 its reverse (120034001), we get a palindrome (220464022).

The spelling of 100430021 in words is "one hundred million, four hundred thirty thousand, twenty-one".