10221705 has 48 divisors (see below), whose sum is σ = 19380816. Its totient is φ = 4953600.

The previous prime is 10221703. The next prime is 10221713. The reversal of 10221705 is 50712201.

It can be written as a sum of positive squares in 8 ways, for example, as 710649 + 9511056 = 843^2 + 3084^2 .

It is not a de Polignac number, because 10221705 - 2¹ = 10221703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221703) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 58999 + ... + 59171.

It is an arithmetic number, because the mean of its divisors is an integer number (403767).

Almost surely, 2^10221705 is an apocalyptic number.

10221705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10221705 is a deficient number, since it is larger than the sum of its proper divisors (9159111).

10221705 is a wasteful number, since it uses less digits than its factorization.

10221705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 10221705 is about 3197.1401283022. The cubic root of 10221705 is about 217.0240086131.

Adding to 10221705 its reverse (50712201), we get a palindrome (60933906).

The spelling of 10221705 in words is "ten million, two hundred twenty-one thousand, seven hundred five".