221668835 has 8 divisors (see below), whose sum is σ = 266086080. Its totient is φ = 177279424.

The previous prime is 221668819. The next prime is 221668859. The reversal of 221668835 is 538866122.

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

It is a cyclic number.

It is not a de Polignac number, because 221668835 - 2⁴ = 221668819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221668792 and 221668801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20231 + ... + 29199.

It is an arithmetic number, because the mean of its divisors is an integer number (33260760).

Almost surely, 2^221668835 is an apocalyptic number.

221668835 is a deficient number, since it is larger than the sum of its proper divisors (44417245).

221668835 is an equidigital number, since it uses as much as digits as its factorization.

221668835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13917.

The product of its digits is 138240, while the sum is 41.

The square root of 221668835 is about 14888.5471084320. The cubic root of 221668835 is about 605.2036606876.

The spelling of 221668835 in words is "two hundred twenty-one million, six hundred sixty-eight thousand, eight hundred thirty-five".