421603506540 has 72 divisors (see below), whose sum is σ = 1286709850608. Its totient is φ = 111737854080.

The previous prime is 421603506529. The next prime is 421603506551. The reversal of 421603506540 is 45605306124.

421603506540 is a `hidden beast` number, since 4 + 2 + 1 + 60 + 3 + 50 + 6 + 540 = 666.

It is an interprime number because it is at equal distance from previous prime (421603506529) and next prime (421603506551).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 421603506495 and 421603506504.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7155451 + ... + 7214130.

Almost surely, 2^421603506540 is an apocalyptic number.

It is an amenable number.

421603506540 is an abundant number, since it is smaller than the sum of its proper divisors (865106344068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421603506540 is a wasteful number, since it uses less digits than its factorization.

421603506540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14369759 (or 14369754 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 421603506540 in words is "four hundred twenty-one billion, six hundred three million, five hundred six thousand, five hundred forty".