421430017 has 4 divisors (see below), whose sum is σ = 446220036. Its totient is φ = 396640000.

The previous prime is 421429991. The next prime is 421430033. The reversal of 421430017 is 710034124.

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 228886641 + 192543376 = 15129^2 + 13876^2 .

It is a cyclic number.

It is not a de Polignac number, because 421430017 - 2¹⁹ = 420905729 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421430017.

It is not an unprimeable number, because it can be changed into a prime (421430047) 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, 12394984 + ... + 12395017.

It is an arithmetic number, because the mean of its divisors is an integer number (111555009).

Almost surely, 2^421430017 is an apocalyptic number.

It is an amenable number.

421430017 is a deficient number, since it is larger than the sum of its proper divisors (24790019).

421430017 is a wasteful number, since it uses less digits than its factorization.

421430017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24790018.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 421430017 is about 20528.7607273308. The cubic root of 421430017 is about 749.7362136036.

The spelling of 421430017 in words is "four hundred twenty-one million, four hundred thirty thousand, seventeen".