421000 has 32 divisors (see below), whose sum is σ = 987480. Its totient is φ = 168000.

The previous prime is 420997. The next prime is 421009. The reversal of 421000 is 124.

It can be written as a sum of positive squares in 4 ways, for example, as 19044 + 401956 = 138^2 + 634^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (421009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 790 + ... + 1210.

2⁴²¹⁰⁰⁰ is an apocalyptic number.

421000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493740).

421000 is an abundant number, since it is smaller than the sum of its proper divisors (566480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421000 is a wasteful number, since it uses less digits than its factorization.

421000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 421000 is about 648.8451279003. The cubic root of 421000 is about 74.9481122586.

Adding to 421000 its reverse (124), we get a palindrome (421124).

The spelling of 421000 in words is "four hundred twenty-one thousand", and thus it is an iban number.