221066433 has 48 divisors (see below), whose sum is σ = 375438336. Its totient is φ = 122744160.

The previous prime is 221066399. The next prime is 221066441. The reversal of 221066433 is 334660122.

221066433 is a `hidden beast` number, since 2 + 2 + 10 + 6 + 643 + 3 = 666.

It is not a de Polignac number, because 221066433 - 2²⁵ = 187512001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221066397 and 221066406.

It is not an unprimeable number, because it can be changed into a prime (221066473) 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 47 ways as a sum of consecutive naturals, for example, 350028 + ... + 350658.

It is an arithmetic number, because the mean of its divisors is an integer number (7821632).

Almost surely, 2^221066433 is an apocalyptic number.

It is an amenable number.

221066433 is a deficient number, since it is larger than the sum of its proper divisors (154371903).

221066433 is a wasteful number, since it uses less digits than its factorization.

221066433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 791 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 221066433 is about 14868.3029630150. The cubic root of 221066433 is about 604.6549342516.

The spelling of 221066433 in words is "two hundred twenty-one million, sixty-six thousand, four hundred thirty-three".