100421503 has 8 divisors (see below), whose sum is σ = 123595808. Its totient is φ = 79454304.

The previous prime is 100421491. The next prime is 100421507. The reversal of 100421503 is 305124001.

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 100421503 - 2⁵ = 100421471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100421507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551676 + ... + 551857.

It is an arithmetic number, because the mean of its divisors is an integer number (15449476).

Almost surely, 2^100421503 is an apocalyptic number.

100421503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

100421503 is a deficient number, since it is larger than the sum of its proper divisors (23174305).

100421503 is a wasteful number, since it uses less digits than its factorization.

100421503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103553.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 100421503 is about 10021.0529885836. The cubic root of 100421503 is about 464.8101170993.

Adding to 100421503 its reverse (305124001), we get a palindrome (405545504).

The spelling of 100421503 in words is "one hundred million, four hundred twenty-one thousand, five hundred three".