421509603 has 4 divisors (see below), whose sum is σ = 562012808. Its totient is φ = 281006400.

The previous prime is 421509601. The next prime is 421509617. The reversal of 421509603 is 306905124.

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

It is not a de Polignac number, because 421509603 - 2¹ = 421509601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421509601) 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, 70251598 + ... + 70251603.

It is an arithmetic number, because the mean of its divisors is an integer number (140503202).

Almost surely, 2^421509603 is an apocalyptic number.

421509603 is a deficient number, since it is larger than the sum of its proper divisors (140503205).

421509603 is a wasteful number, since it uses less digits than its factorization.

421509603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140503204.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 421509603 is about 20530.6990382695. The cubic root of 421509603 is about 749.7834058998.

The spelling of 421509603 in words is "four hundred twenty-one million, five hundred nine thousand, six hundred three".