421545533 has 12 divisors (see below), whose sum is σ = 458527680. Its totient is φ = 386459640.

The previous prime is 421545529. The next prime is 421545539. The reversal of 421545533 is 335545124.

It is a happy number.

It is not a de Polignac number, because 421545533 - 2² = 421545529 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 421545533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421545539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6716 + ... + 29802.

It is an arithmetic number, because the mean of its divisors is an integer number (38210640).

Almost surely, 2^421545533 is an apocalyptic number.

It is an amenable number.

421545533 is a deficient number, since it is larger than the sum of its proper divisors (36982147).

421545533 is a wasteful number, since it uses less digits than its factorization.

421545533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23168 (or 23137 counting only the distinct ones).

The product of its digits is 36000, while the sum is 32.

The square root of 421545533 is about 20531.5740507152. The cubic root of 421545533 is about 749.8047094495.

The spelling of 421545533 in words is "four hundred twenty-one million, five hundred forty-five thousand, five hundred thirty-three".