100421993 has 16 divisors (see below), whose sum is σ = 116640000. Its totient is φ = 84682752.

The previous prime is 100421969. The next prime is 100422001. The reversal of 100421993 is 399124001.

It is a happy number.

It is not a de Polignac number, because 100421993 - 2⁶ = 100421929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100021993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223433 + ... + 223881.

It is an arithmetic number, because the mean of its divisors is an integer number (7290000).

Almost surely, 2^100421993 is an apocalyptic number.

It is an amenable number.

100421993 is a deficient number, since it is larger than the sum of its proper divisors (16218007).

100421993 is an equidigital number, since it uses as much as digits as its factorization.

100421993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904.

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

The square root of 100421993 is about 10021.0774370823. The cubic root of 100421993 is about 464.8108731014.

Adding to 100421993 its reverse (399124001), we get a palindrome (499545994).

The spelling of 100421993 in words is "one hundred million, four hundred twenty-one thousand, nine hundred ninety-three".