100021398 has 8 divisors (see below), whose sum is σ = 200042808. Its totient is φ = 33340464.

The previous prime is 100021393. The next prime is 100021399. The reversal of 100021398 is 893120001.

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

100021398 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8335111 + ... + 8335122.

It is an arithmetic number, because the mean of its divisors is an integer number (25005351).

Almost surely, 2^100021398 is an apocalyptic number.

100021398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

100021398 is a wasteful number, since it uses less digits than its factorization.

100021398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16670238.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 100021398 is about 10001.0698427718. The cubic root of 100021398 is about 464.1919879061.

Adding to 100021398 its reverse (893120001), we get a palindrome (993141399).

The spelling of 100021398 in words is "one hundred million, twenty-one thousand, three hundred ninety-eight".