100421399 has 4 divisors (see below), whose sum is σ = 108146136. Its totient is φ = 92696664.

The previous prime is 100421359. The next prime is 100421407. The reversal of 100421399 is 993124001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993124001 = 43 ⋅23095907.

It is a cyclic number.

It is not a de Polignac number, because 100421399 - 2⁸ = 100421143 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 (100421359) 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, 3862349 + ... + 3862374.

It is an arithmetic number, because the mean of its divisors is an integer number (27036534).

Almost surely, 2^100421399 is an apocalyptic number.

100421399 is a deficient number, since it is larger than the sum of its proper divisors (7724737).

100421399 is an equidigital number, since it uses as much as digits as its factorization.

100421399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7724736.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 100421399 is about 10021.0477995068. The cubic root of 100421399 is about 464.8099566414.

The spelling of 100421399 in words is "one hundred million, four hundred twenty-one thousand, three hundred ninety-nine".