221749233 has 8 divisors (see below), whose sum is σ = 308520768. Its totient is φ = 141405264.

The previous prime is 221749223. The next prime is 221749249. The reversal of 221749233 is 332947122.

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

It is not a de Polignac number, because 221749233 - 2¹² = 221745137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221749194 and 221749203.

It is not an unprimeable number, because it can be changed into a prime (221749223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606810 + ... + 1606947.

It is an arithmetic number, because the mean of its divisors is an integer number (38565096).

Almost surely, 2^221749233 is an apocalyptic number.

221749233 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

221749233 is a deficient number, since it is larger than the sum of its proper divisors (86771535).

221749233 is a wasteful number, since it uses less digits than its factorization.

221749233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213783.

The product of its digits is 18144, while the sum is 33.

The square root of 221749233 is about 14891.2468584736. The cubic root of 221749233 is about 605.2768197954.

The spelling of 221749233 in words is "two hundred twenty-one million, seven hundred forty-nine thousand, two hundred thirty-three".