421402243 has 2 divisors, whose sum is σ = 421402244. Its totient is φ = 421402242.

The previous prime is 421402231. The next prime is 421402271. The reversal of 421402243 is 342204124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421402243 is a prime.

It is not a weakly prime, because it can be changed into another prime (421406243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210701121 + 210701122.

It is an arithmetic number, because the mean of its divisors is an integer number (210701122).

Almost surely, 2^421402243 is an apocalyptic number.

421402243 is a deficient number, since it is larger than the sum of its proper divisors (1).

421402243 is an equidigital number, since it uses as much as digits as its factorization.

421402243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 421402243 is about 20528.0842506065. The cubic root of 421402243 is about 749.7197429914.

Adding to 421402243 its reverse (342204124), we get a palindrome (763606367).

The spelling of 421402243 in words is "four hundred twenty-one million, four hundred two thousand, two hundred forty-three".