221973143 has 8 divisors (see below), whose sum is σ = 267035520. Its totient is φ = 180248760.

The previous prime is 221973121. The next prime is 221973179. The reversal of 221973143 is 341379122.

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 221973143 - 2¹² = 221969047 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 (221973043) 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, 834353 + ... + 834618.

It is an arithmetic number, because the mean of its divisors is an integer number (33379440).

Almost surely, 2^221973143 is an apocalyptic number.

221973143 is a deficient number, since it is larger than the sum of its proper divisors (45062377).

221973143 is a wasteful number, since it uses less digits than its factorization.

221973143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668997.

The product of its digits is 9072, while the sum is 32.

The square root of 221973143 is about 14898.7631365828. The cubic root of 221973143 is about 605.4804761815.

The spelling of 221973143 in words is "two hundred twenty-one million, nine hundred seventy-three thousand, one hundred forty-three".