221940706 has 16 divisors (see below), whose sum is σ = 360900288. Its totient is φ = 101754000.

The previous prime is 221940647. The next prime is 221940707. The reversal of 221940706 is 607049122.

It is not an unprimeable number, because it can be changed into a prime (221940707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24340 + ... + 32191.

It is an arithmetic number, because the mean of its divisors is an integer number (22556268).

Almost surely, 2^221940706 is an apocalyptic number.

221940706 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221940706 is a deficient number, since it is larger than the sum of its proper divisors (138959582).

221940706 is a wasteful number, since it uses less digits than its factorization.

221940706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56697.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 221940706 is about 14897.6745165143. The cubic root of 221940706 is about 605.4509817320.

Adding to 221940706 its reverse (607049122), we get a palindrome (828989828).

The spelling of 221940706 in words is "two hundred twenty-one million, nine hundred forty thousand, seven hundred six".