221868685 has 8 divisors (see below), whose sum is σ = 267837696. Its totient is φ = 176431440.

The previous prime is 221868631. The next prime is 221868701. The reversal of 221868685 is 586868122.

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

It is not a de Polignac number, because 221868685 - 2²¹ = 219771533 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 132021 + ... + 133690.

It is an arithmetic number, because the mean of its divisors is an integer number (33479712).

Almost surely, 2^221868685 is an apocalyptic number.

It is an amenable number.

221868685 is a deficient number, since it is larger than the sum of its proper divisors (45969011).

221868685 is a wasteful number, since it uses less digits than its factorization.

221868685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265883.

The product of its digits is 368640, while the sum is 46.

The square root of 221868685 is about 14895.2571310468. The cubic root of 221868685 is about 605.3854839038.

The spelling of 221868685 in words is "two hundred twenty-one million, eight hundred sixty-eight thousand, six hundred eighty-five".