221066434 has 8 divisors (see below), whose sum is σ = 333985680. Its totient is φ = 109737876.

The previous prime is 221066399. The next prime is 221066441. The reversal of 221066434 is 434660122.

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

It is an unprimeable number.

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, 397324 + ... + 397879.

It is an arithmetic number, because the mean of its divisors is an integer number (41748210).

Almost surely, 2^221066434 is an apocalyptic number.

221066434 is a deficient number, since it is larger than the sum of its proper divisors (112919246).

221066434 is a wasteful number, since it uses less digits than its factorization.

221066434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795344.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 221066434 is about 14868.3029966436. The cubic root of 221066434 is about 604.6549351634.

It can be divided in two parts, 2210 and 66434, that added together give a square (68644 = 262²).

The spelling of 221066434 in words is "two hundred twenty-one million, sixty-six thousand, four hundred thirty-four".