221565734 has 8 divisors (see below), whose sum is σ = 357913920. Its totient is φ = 102261096.

The previous prime is 221565727. The next prime is 221565749. The reversal of 221565734 is 437565122.

221565734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 221565694 and 221565703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4260854 + ... + 4260905.

It is an arithmetic number, because the mean of its divisors is an integer number (44739240).

Almost surely, 2^221565734 is an apocalyptic number.

221565734 is a deficient number, since it is larger than the sum of its proper divisors (136348186).

221565734 is a wasteful number, since it uses less digits than its factorization.

221565734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8521774.

The product of its digits is 50400, while the sum is 35.

The square root of 221565734 is about 14885.0842792374. The cubic root of 221565734 is about 605.1098168251.

The spelling of 221565734 in words is "two hundred twenty-one million, five hundred sixty-five thousand, seven hundred thirty-four".