421563669 has 4 divisors (see below), whose sum is σ = 562084896. Its totient is φ = 281042444.

The previous prime is 421563647. The next prime is 421563677. The reversal of 421563669 is 966365124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421563669 - 2⁸ = 421563413 is a prime.

It is a super-2 number, since 2×421563669² = 355431854041483122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 421563669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421563269) 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, 70260609 + ... + 70260614.

It is an arithmetic number, because the mean of its divisors is an integer number (140521224).

Almost surely, 2^421563669 is an apocalyptic number.

It is an amenable number.

421563669 is a deficient number, since it is larger than the sum of its proper divisors (140521227).

421563669 is a wasteful number, since it uses less digits than its factorization.

421563669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140521226.

The product of its digits is 233280, while the sum is 42.

The square root of 421563669 is about 20532.0157071828. The cubic root of 421563669 is about 749.8154621537.

The spelling of 421563669 in words is "four hundred twenty-one million, five hundred sixty-three thousand, six hundred sixty-nine".