421810045 has 4 divisors (see below), whose sum is σ = 506172060. Its totient is φ = 337448032.

The previous prime is 421810033. The next prime is 421810049. The reversal of 421810045 is 540018124.

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 53860921 + 367949124 = 7339^2 + 19182^2 .

It is a cyclic number.

It is not a de Polignac number, because 421810045 - 2⁷ = 421809917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421810049) 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, 42181000 + ... + 42181009.

It is an arithmetic number, because the mean of its divisors is an integer number (126543015).

Almost surely, 2^421810045 is an apocalyptic number.

It is an amenable number.

421810045 is a deficient number, since it is larger than the sum of its proper divisors (84362015).

421810045 is an equidigital number, since it uses as much as digits as its factorization.

421810045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84362014.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 421810045 is about 20538.0146314097. The cubic root of 421810045 is about 749.9615061725.

Adding to 421810045 its reverse (540018124), we get a palindrome (961828169).

The spelling of 421810045 in words is "four hundred twenty-one million, eight hundred ten thousand, forty-five".