221416666 has 8 divisors (see below), whose sum is σ = 332276724. Its totient is φ = 110657760.

The previous prime is 221416639. The next prime is 221416681. The reversal of 221416666 is 666614122.

221416666 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 216943441 + 4473225 = 14729^2 + 2115^2 .

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

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, 19555 + ... + 28726.

Almost surely, 2^221416666 is an apocalyptic number.

221416666 is a deficient number, since it is larger than the sum of its proper divisors (110860058).

221416666 is a wasteful number, since it uses less digits than its factorization.

221416666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50576.

The product of its digits is 20736, while the sum is 34.

The square root of 221416666 is about 14880.0761422783. The cubic root of 221416666 is about 604.9740817164.

The spelling of 221416666 in words is "two hundred twenty-one million, four hundred sixteen thousand, six hundred sixty-six".