421020 has 36 divisors (see below), whose sum is σ = 1277640. Its totient is φ = 112224.

The previous prime is 421019. The next prime is 421033. The reversal of 421020 is 20124.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 420993 and 421011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 990 + ... + 1349.

It is an arithmetic number, because the mean of its divisors is an integer number (35490).

2⁴²¹⁰²⁰ is an apocalyptic number.

It is an amenable number.

421020 is an abundant number, since it is smaller than the sum of its proper divisors (856620).

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

421020 is a wasteful number, since it uses less digits than its factorization.

421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 421020 is about 648.8605397156. The cubic root of 421020 is about 74.9492990666.

Adding to 421020 its reverse (20124), we get a palindrome (441144).

The spelling of 421020 in words is "four hundred twenty-one thousand, twenty", and thus it is an iban number.