421816885 has 16 divisors (see below), whose sum is σ = 591947136. Its totient is φ = 282518208.

The previous prime is 421816859. The next prime is 421816921. The reversal of 421816885 is 588618124.

It is not a de Polignac number, because 421816885 - 2¹³ = 421808693 is a prime.

It is a super-2 number, since 2×421816885² = 355858968942206450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138634 + ... + 141643.

It is an arithmetic number, because the mean of its divisors is an integer number (36996696).

Almost surely, 2^421816885 is an apocalyptic number.

It is an amenable number.

421816885 is a deficient number, since it is larger than the sum of its proper divisors (170130251).

421816885 is a wasteful number, since it uses less digits than its factorization.

421816885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280332.

The product of its digits is 122880, while the sum is 43.

The square root of 421816885 is about 20538.1811512120. The cubic root of 421816885 is about 749.9655599000.

The spelling of 421816885 in words is "four hundred twenty-one million, eight hundred sixteen thousand, eight hundred eighty-five".