100809421 has 8 divisors (see below), whose sum is σ = 107611200. Its totient is φ = 94157280.

The previous prime is 100809409. The next prime is 100809463. The reversal of 100809421 is 124908001.

It is a happy number.

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 100809421 - 2¹⁷ = 100678349 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 (100809521) 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, 36016 + ... + 38713.

It is an arithmetic number, because the mean of its divisors is an integer number (13451400).

Almost surely, 2^100809421 is an apocalyptic number.

It is an amenable number.

100809421 is a deficient number, since it is larger than the sum of its proper divisors (6801779).

100809421 is an equidigital number, since it uses as much as digits as its factorization.

100809421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74819.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 100809421 is about 10040.3894844772. The cubic root of 100809421 is about 465.4078527498.

The spelling of 100809421 in words is "one hundred million, eight hundred nine thousand, four hundred twenty-one".