10221570 has 48 divisors (see below), whose sum is σ = 26802360. Its totient is φ = 2702592.

The previous prime is 10221557. The next prime is 10221571. The reversal of 10221570 is 7512201.

It can be written as a sum of positive squares in 4 ways, for example, as 8803089 + 1418481 = 2967^2 + 1191^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10221571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11916 + ... + 12744.

Almost surely, 2^10221570 is an apocalyptic number.

10221570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 10221570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13401180).

10221570 is an abundant number, since it is smaller than the sum of its proper divisors (16580790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10221570 is a wasteful number, since it uses less digits than its factorization.

10221570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 976 counting only the distinct ones).

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

The square root of 10221570 is about 3197.1190156139. The cubic root of 10221570 is about 217.0230531831.

Adding to 10221570 its reverse (7512201), we get a palindrome (17733771).

The spelling of 10221570 in words is "ten million, two hundred twenty-one thousand, five hundred seventy".