100421428 has 24 divisors (see below), whose sum is σ = 178855040. Its totient is φ = 49325760.

The previous prime is 100421417. The next prime is 100421429. The reversal of 100421428 is 824124001.

It is a junction number, because it is equal to n+sod(n) for n = 100421399 and 100421408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100421429) 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, 96133 + ... + 97171.

Almost surely, 2^100421428 is an apocalyptic number.

It is an amenable number.

100421428 is a deficient number, since it is larger than the sum of its proper divisors (78433612).

100421428 is a wasteful number, since it uses less digits than its factorization.

100421428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447 (or 1445 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 100421428 is about 10021.0492464612. The cubic root of 100421428 is about 464.8100013845.

Adding to 100421428 its reverse (824124001), we get a palindrome (924545429).

The spelling of 100421428 in words is "one hundred million, four hundred twenty-one thousand, four hundred twenty-eight".