221434566 has 16 divisors (see below), whose sum is σ = 454839024. Its totient is φ = 71816544.

The previous prime is 221434559. The next prime is 221434573. The reversal of 221434566 is 665434122.

221434566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221434559) and next prime (221434573).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498505 + ... + 498948.

It is an arithmetic number, because the mean of its divisors is an integer number (28427439).

Almost surely, 2^221434566 is an apocalyptic number.

221434566 is an abundant number, since it is smaller than the sum of its proper divisors (233404458).

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

221434566 is a wasteful number, since it uses less digits than its factorization.

221434566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997495.

The product of its digits is 34560, while the sum is 33.

The square root of 221434566 is about 14880.6776055393. The cubic root of 221434566 is about 604.9903839284.

Adding to 221434566 its reverse (665434122), we get a palindrome (886868688).

The spelling of 221434566 in words is "two hundred twenty-one million, four hundred thirty-four thousand, five hundred sixty-six".