421272815 has 4 divisors (see below), whose sum is σ = 505527384. Its totient is φ = 337018248.

The previous prime is 421272809. The next prime is 421272829. The reversal of 421272815 is 518272124.

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

It is a cyclic number.

It is not a de Polignac number, because 421272815 - 2⁴ = 421272799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42127277 + ... + 42127286.

It is an arithmetic number, because the mean of its divisors is an integer number (126381846).

Almost surely, 2^421272815 is an apocalyptic number.

421272815 is a deficient number, since it is larger than the sum of its proper divisors (84254569).

421272815 is an equidigital number, since it uses as much as digits as its factorization.

421272815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84254568.

The product of its digits is 8960, while the sum is 32.

The square root of 421272815 is about 20524.9315467799. The cubic root of 421272815 is about 749.6429797053.

The spelling of 421272815 in words is "four hundred twenty-one million, two hundred seventy-two thousand, eight hundred fifteen".