421661443 has 8 divisors (see below), whose sum is σ = 482584160. Its totient is φ = 360910080.

The previous prime is 421661437. The next prime is 421661447. The reversal of 421661443 is 344166124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421661443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421661447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37518 + ... + 47443.

It is an arithmetic number, because the mean of its divisors is an integer number (60323020).

Almost surely, 2^421661443 is an apocalyptic number.

421661443 is a deficient number, since it is larger than the sum of its proper divisors (60922717).

421661443 is an equidigital number, since it uses as much as digits as its factorization.

421661443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85677.

The product of its digits is 13824, while the sum is 31.

The square root of 421661443 is about 20534.3965823201. The cubic root of 421661443 is about 749.8734263437.

The spelling of 421661443 in words is "four hundred twenty-one million, six hundred sixty-one thousand, four hundred forty-three".