421305501 has 8 divisors (see below), whose sum is σ = 561841024. Its totient is φ = 280820160.

The previous prime is 421305481. The next prime is 421305503. The reversal of 421305501 is 105503124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421305501 - 2²² = 417111197 is a prime.

It is a super-2 number, since 2×421305501² = 354996650345722002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421305503) 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, 16965 + ... + 33621.

It is an arithmetic number, because the mean of its divisors is an integer number (70230128).

Almost surely, 2^421305501 is an apocalyptic number.

It is an amenable number.

421305501 is a deficient number, since it is larger than the sum of its proper divisors (140535523).

421305501 is a wasteful number, since it uses less digits than its factorization.

421305501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25091.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 421305501 is about 20525.7277824685. The cubic root of 421305501 is about 749.6623671393.

Adding to 421305501 its reverse (105503124), we get a palindrome (526808625).

The spelling of 421305501 in words is "four hundred twenty-one million, three hundred five thousand, five hundred one".