221487434 has 8 divisors (see below), whose sum is σ = 379692768. Its totient is φ = 94923180.

The previous prime is 221487433. The next prime is 221487437. The reversal of 221487434 is 434784122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 221487394 and 221487403.

It is not an unprimeable number, because it can be changed into a prime (221487433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7910252 + ... + 7910279.

It is an arithmetic number, because the mean of its divisors is an integer number (47461596).

Almost surely, 2^221487434 is an apocalyptic number.

221487434 is a deficient number, since it is larger than the sum of its proper divisors (158205334).

221487434 is a wasteful number, since it uses less digits than its factorization.

221487434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15820540.

The product of its digits is 43008, while the sum is 35.

The square root of 221487434 is about 14882.4538971233. The cubic root of 221487434 is about 605.0385277015.

The spelling of 221487434 in words is "two hundred twenty-one million, four hundred eighty-seven thousand, four hundred thirty-four".