421252243 has 2 divisors, whose sum is σ = 421252244. Its totient is φ = 421252242.

The previous prime is 421252241. The next prime is 421252283. The reversal of 421252243 is 342252124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421252243 - 2¹ = 421252241 is a prime.

Together with 421252241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (421252241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210626121 + 210626122.

It is an arithmetic number, because the mean of its divisors is an integer number (210626122).

Almost surely, 2^421252243 is an apocalyptic number.

421252243 is a deficient number, since it is larger than the sum of its proper divisors (1).

421252243 is an equidigital number, since it uses as much as digits as its factorization.

421252243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 25.

The square root of 421252243 is about 20524.4303940450. The cubic root of 421252243 is about 749.6307770772.

The spelling of 421252243 in words is "four hundred twenty-one million, two hundred fifty-two thousand, two hundred forty-three".