221806734 has 16 divisors (see below), whose sum is σ = 444724560. Its totient is φ = 73750400.

The previous prime is 221806729. The next prime is 221806747. The reversal of 221806734 is 437608122.

221806734 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221806695 and 221806704.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43689 + ... + 48500.

It is an arithmetic number, because the mean of its divisors is an integer number (27795285).

Almost surely, 2^221806734 is an apocalyptic number.

221806734 is an abundant number, since it is smaller than the sum of its proper divisors (222917826).

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

221806734 is a wasteful number, since it uses less digits than its factorization.

221806734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92595.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 221806734 is about 14893.1774312938. The cubic root of 221806734 is about 605.3291326626.

The spelling of 221806734 in words is "two hundred twenty-one million, eight hundred six thousand, seven hundred thirty-four".