221006375 has 16 divisors (see below), whose sum is σ = 292043232. Its totient is φ = 166403200.

The previous prime is 221006363. The next prime is 221006381. The reversal of 221006375 is 573600122.

It is not a de Polignac number, because 221006375 - 2⁶ = 221006311 is a prime.

It is a super-3 number, since 3×221006375³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49877 + ... + 54126.

It is an arithmetic number, because the mean of its divisors is an integer number (18252702).

Almost surely, 2^221006375 is an apocalyptic number.

221006375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221006375 is a deficient number, since it is larger than the sum of its proper divisors (71036857).

221006375 is a wasteful number, since it uses less digits than its factorization.

221006375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104035 (or 104025 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 221006375 is about 14866.2831602254. The cubic root of 221006375 is about 604.6001729527.

Adding to 221006375 its reverse (573600122), we get a palindrome (794606497).

The spelling of 221006375 in words is "two hundred twenty-one million, six thousand, three hundred seventy-five".