221864734 has 32 divisors (see below), whose sum is σ = 410348736. Its totient is φ = 87609600.

The previous prime is 221864723. The next prime is 221864743. The reversal of 221864734 is 437468122.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 221864693 and 221864702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169884 + ... + 171184.

It is an arithmetic number, because the mean of its divisors is an integer number (12823398).

Almost surely, 2^221864734 is an apocalyptic number.

221864734 is a deficient number, since it is larger than the sum of its proper divisors (188484002).

221864734 is a wasteful number, since it uses less digits than its factorization.

221864734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260.

The product of its digits is 64512, while the sum is 37.

The square root of 221864734 is about 14895.1245043471. The cubic root of 221864734 is about 605.3818903484.

The spelling of 221864734 in words is "two hundred twenty-one million, eight hundred sixty-four thousand, seven hundred thirty-four".