10221345 has 24 divisors (see below), whose sum is σ = 17822376. Its totient is φ = 5419008.

The previous prime is 10221293. The next prime is 10221347. The reversal of 10221345 is 54312201.

It can be written as a sum of positive squares in 4 ways, for example, as 5239521 + 4981824 = 2289^2 + 2232^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10221345 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10221347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8289 + ... + 9441.

It is an arithmetic number, because the mean of its divisors is an integer number (742599).

Almost surely, 2^10221345 is an apocalyptic number.

10221345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10221345 is a deficient number, since it is larger than the sum of its proper divisors (7601031).

10221345 is a wasteful number, since it uses less digits than its factorization.

10221345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1361 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 10221345 is about 3197.0838274903. The cubic root of 10221345 is about 217.0214607811.

Adding to 10221345 its reverse (54312201), we get a palindrome (64533546).

The spelling of 10221345 in words is "ten million, two hundred twenty-one thousand, three hundred forty-five".