100421855 has 8 divisors (see below), whose sum is σ = 121246512. Its totient is φ = 79843968.

The previous prime is 100421851. The next prime is 100421861. The reversal of 100421855 is 558124001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 100421855 - 2² = 100421851 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 (100421851) 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 7 ways as a sum of consecutive naturals, for example, 60794 + ... + 62423.

It is an arithmetic number, because the mean of its divisors is an integer number (15155814).

Almost surely, 2^100421855 is an apocalyptic number.

100421855 is a deficient number, since it is larger than the sum of its proper divisors (20824657).

100421855 is a wasteful number, since it uses less digits than its factorization.

100421855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123385.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 100421855 is about 10021.0705515928. The cubic root of 100421855 is about 464.8106601868.

Adding to 100421855 its reverse (558124001), we get a palindrome (658545856).

The spelling of 100421855 in words is "one hundred million, four hundred twenty-one thousand, eight hundred fifty-five".