426816021 has 4 divisors (see below), whose sum is σ = 569088032. Its totient is φ = 284544012.

The previous prime is 426816011. The next prime is 426816023. The reversal of 426816021 is 120618624.

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 not a de Polignac number, because 426816021 - 2¹⁸ = 426553877 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 426816021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426816023) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 71136001 + ... + 71136006.

It is an arithmetic number, because the mean of its divisors is an integer number (142272008).

Almost surely, 2^426816021 is an apocalyptic number.

It is an amenable number.

426816021 is a deficient number, since it is larger than the sum of its proper divisors (142272011).

426816021 is a wasteful number, since it uses less digits than its factorization.

426816021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142272010.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 426816021 is about 20659.5261562312. The cubic root of 426816021 is about 752.9166552376.

The spelling of 426816021 in words is "four hundred twenty-six million, eight hundred sixteen thousand, twenty-one".