421533481 has 4 divisors (see below), whose sum is σ = 421877700. Its totient is φ = 421189264.

The previous prime is 421533467. The next prime is 421533517. The reversal of 421533481 is 184335124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 234090000 + 187443481 = 15300^2 + 13691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421533481 is a prime.

It is a super-2 number, since 2×421533481² = 355380951207954722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421533401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170266 + ... + 172723.

It is an arithmetic number, because the mean of its divisors is an integer number (105469425).

Almost surely, 2^421533481 is an apocalyptic number.

It is an amenable number.

421533481 is a deficient number, since it is larger than the sum of its proper divisors (344219).

421533481 is a wasteful number, since it uses less digits than its factorization.

421533481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344218.

The product of its digits is 11520, while the sum is 31.

The square root of 421533481 is about 20531.2805494445. The cubic root of 421533481 is about 749.7975637347.

Subtracting from 421533481 its product of digits (11520), we obtain a square (421521961 = 20531²).

The spelling of 421533481 in words is "four hundred twenty-one million, five hundred thirty-three thousand, four hundred eighty-one".