100421443 has 2 divisors, whose sum is σ = 100421444. Its totient is φ = 100421442.

The previous prime is 100421437. The next prime is 100421449. The reversal of 100421443 is 344124001.

It is a balanced prime because it is at equal distance from previous prime (100421437) and next prime (100421449).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100421443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100421443.

It is not a weakly prime, because it can be changed into another prime (100421449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210721 + 50210722.

It is an arithmetic number, because the mean of its divisors is an integer number (50210722).

Almost surely, 2^100421443 is an apocalyptic number.

100421443 is a deficient number, since it is larger than the sum of its proper divisors (1).

100421443 is an equidigital number, since it uses as much as digits as its factorization.

100421443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 100421443 is about 10021.0499948858. The cubic root of 100421443 is about 464.8100245275.

Adding to 100421443 its reverse (344124001), we get a palindrome (444545444).

The spelling of 100421443 in words is "one hundred million, four hundred twenty-one thousand, four hundred forty-three".