221238753 has 8 divisors (see below), whose sum is σ = 295473408. Its totient is φ = 147248304.

The previous prime is 221238751. The next prime is 221238763. The reversal of 221238753 is 357832122.

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

It is not a de Polignac number, because 221238753 - 2¹ = 221238751 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221238751) 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, 58926 + ... + 62567.

It is an arithmetic number, because the mean of its divisors is an integer number (36934176).

Almost surely, 2^221238753 is an apocalyptic number.

It is an amenable number.

221238753 is a deficient number, since it is larger than the sum of its proper divisors (74234655).

221238753 is a wasteful number, since it uses less digits than its factorization.

221238753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122103.

The product of its digits is 20160, while the sum is 33.

The square root of 221238753 is about 14874.0967120696. The cubic root of 221238753 is about 604.8120017836.

It can be divided in two parts, 22123 and 8753, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 221238753 in words is "two hundred twenty-one million, two hundred thirty-eight thousand, seven hundred fifty-three".