421002443 has 2 divisors, whose sum is σ = 421002444. Its totient is φ = 421002442.

The previous prime is 421002427. The next prime is 421002481. The reversal of 421002443 is 344200124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421002443 - 2⁴ = 421002427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421002343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210501221 + 210501222.

It is an arithmetic number, because the mean of its divisors is an integer number (210501222).

Almost surely, 2^421002443 is an apocalyptic number.

421002443 is a deficient number, since it is larger than the sum of its proper divisors (1).

421002443 is an equidigital number, since it uses as much as digits as its factorization.

421002443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 421002443 is about 20518.3440608642. The cubic root of 421002443 is about 749.4825722920.

Adding to 421002443 its reverse (344200124), we get a palindrome (765202567).

The spelling of 421002443 in words is "four hundred twenty-one million, two thousand, four hundred forty-three".