421145 has 4 divisors (see below), whose sum is σ = 505380. Its totient is φ = 336912.

The previous prime is 421133. The next prime is 421147. The reversal of 421145 is 541124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80089 + 341056 = 283^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 421145 - 2⁶ = 421081 is a prime.

It is a super-2 number, since 2×421145² = 354726222050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421147) 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, 42110 + ... + 42119.

It is an arithmetic number, because the mean of its divisors is an integer number (126345).

2⁴²¹¹⁴⁵ is an apocalyptic number.

It is an amenable number.

421145 is a deficient number, since it is larger than the sum of its proper divisors (84235).

421145 is an equidigital number, since it uses as much as digits as its factorization.

421145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84234.

The product of its digits is 160, while the sum is 17.

The square root of 421145 is about 648.9568552685. The cubic root of 421145 is about 74.9567157652.

Adding to 421145 its reverse (541124), we get a palindrome (962269).

The spelling of 421145 in words is "four hundred twenty-one thousand, one hundred forty-five".