221869973 has 8 divisors (see below), whose sum is σ = 251512800. Its totient is φ = 194023728.

The previous prime is 221869933. The next prime is 221869979. The reversal of 221869973 is 379968122.

It is a happy number.

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 221869973 - 2⁶ = 221869909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221869979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448883 + ... + 449376.

It is an arithmetic number, because the mean of its divisors is an integer number (31439100).

Almost surely, 2^221869973 is an apocalyptic number.

It is an amenable number.

221869973 is a deficient number, since it is larger than the sum of its proper divisors (29642827).

221869973 is a wasteful number, since it uses less digits than its factorization.

221869973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898291.

The product of its digits is 326592, while the sum is 47.

The square root of 221869973 is about 14895.3003662229. The cubic root of 221869973 is about 605.3866553700.

The spelling of 221869973 in words is "two hundred twenty-one million, eight hundred sixty-nine thousand, nine hundred seventy-three".