100021423 has 4 divisors (see below), whose sum is σ = 100132128. Its totient is φ = 99910720.

The previous prime is 100021409. The next prime is 100021429. The reversal of 100021423 is 324120001.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100021423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53986 + ... + 55807.

It is an arithmetic number, because the mean of its divisors is an integer number (25033032).

Almost surely, 2^100021423 is an apocalyptic number.

100021423 is a deficient number, since it is larger than the sum of its proper divisors (110705).

100021423 is an equidigital number, since it uses as much as digits as its factorization.

100021423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110704.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 100021423 is about 10001.0710926380. The cubic root of 100021423 is about 464.1920265805.

Adding to 100021423 its reverse (324120001), we get a palindrome (424141424).

The spelling of 100021423 in words is "one hundred million, twenty-one thousand, four hundred twenty-three".