100445421 has 4 divisors (see below), whose sum is σ = 133927232. Its totient is φ = 66963612.

The previous prime is 100445399. The next prime is 100445437. The reversal of 100445421 is 124544001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124544001 = 3 ⋅41514667.

It is not a de Polignac number, because 100445421 - 2¹⁰ = 100444397 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 (100445021) 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, 16740901 + ... + 16740906.

It is an arithmetic number, because the mean of its divisors is an integer number (33481808).

Almost surely, 2^100445421 is an apocalyptic number.

It is an amenable number.

100445421 is a deficient number, since it is larger than the sum of its proper divisors (33481811).

100445421 is an equidigital number, since it uses as much as digits as its factorization.

100445421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33481810.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 100445421 is about 10022.2463050955. The cubic root of 100445421 is about 464.8470163873.

Adding to 100445421 its reverse (124544001), we get a palindrome (224989422).

The spelling of 100445421 in words is "one hundred million, four hundred forty-five thousand, four hundred twenty-one".