421994533 has 4 divisors (see below), whose sum is σ = 429956748. Its totient is φ = 414032320.

The previous prime is 421994477. The next prime is 421994543. The reversal of 421994533 is 335499124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 289238049 + 132756484 = 17007^2 + 11522^2 .

It is a cyclic number.

It is not a de Polignac number, because 421994533 - 2⁹ = 421994021 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421994543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3981028 + ... + 3981133.

It is an arithmetic number, because the mean of its divisors is an integer number (107489187).

Almost surely, 2^421994533 is an apocalyptic number.

It is an amenable number.

421994533 is a deficient number, since it is larger than the sum of its proper divisors (7962215).

421994533 is an equidigital number, since it uses as much as digits as its factorization.

421994533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7962214.

The product of its digits is 116640, while the sum is 40.

The square root of 421994533 is about 20542.5055190451. The cubic root of 421994533 is about 750.0708276814.

The spelling of 421994533 in words is "four hundred twenty-one million, nine hundred ninety-four thousand, five hundred thirty-three".