421242505 has 8 divisors (see below), whose sum is σ = 506460672. Its totient is φ = 336347568.

The previous prime is 421242443. The next prime is 421242511. The reversal of 421242505 is 505242124.

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

It is a cyclic number.

It is not a de Polignac number, because 421242505 - 2⁷ = 421242377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421242505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77929 + ... + 83158.

It is an arithmetic number, because the mean of its divisors is an integer number (63307584).

Almost surely, 2^421242505 is an apocalyptic number.

It is an amenable number.

421242505 is a deficient number, since it is larger than the sum of its proper divisors (85218167).

421242505 is a wasteful number, since it uses less digits than its factorization.

421242505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161615.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 421242505 is about 20524.1931631916. The cubic root of 421242505 is about 749.6250006801.

Adding to 421242505 its reverse (505242124), we get a palindrome (926484629).

The spelling of 421242505 in words is "four hundred twenty-one million, two hundred forty-two thousand, five hundred five".