426021 has 4 divisors (see below), whose sum is σ = 568032. Its totient is φ = 284012.

The previous prime is 426011. The next prime is 426061. The reversal of 426021 is 120624.

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 426021 - 2⁵ = 425989 is a prime.

It is a d-powerful number, because it can be written as 4⁹ + 2¹⁵ + 0 + 6² + 2¹⁷ + 1 .

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71001 + ... + 71006.

It is an arithmetic number, because the mean of its divisors is an integer number (142008).

2⁴²⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

426021 is a deficient number, since it is larger than the sum of its proper divisors (142011).

426021 is a wasteful number, since it uses less digits than its factorization.

426021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142010.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 426021 is about 652.7028420346. The cubic root of 426021 is about 75.2448884141.

Adding to 426021 its reverse (120624), we get a palindrome (546645).

The spelling of 426021 in words is "four hundred twenty-six thousand, twenty-one".