100243421 has 2 divisors, whose sum is σ = 100243422. Its totient is φ = 100243420.

The previous prime is 100243417. The next prime is 100243439. The reversal of 100243421 is 124342001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99900025 + 343396 = 9995^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 100243421 - 2² = 100243417 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100243421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100243321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50121710 + 50121711.

It is an arithmetic number, because the mean of its divisors is an integer number (50121711).

Almost surely, 2^100243421 is an apocalyptic number.

It is an amenable number.

100243421 is a deficient number, since it is larger than the sum of its proper divisors (1).

100243421 is an equidigital number, since it uses as much as digits as its factorization.

100243421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 100243421 is about 10012.1636522782. The cubic root of 100243421 is about 464.5351982483.

Adding to 100243421 its reverse (124342001), we get a palindrome (224585422).

The spelling of 100243421 in words is "one hundred million, two hundred forty-three thousand, four hundred twenty-one".