10221440 has 32 divisors (see below), whose sum is σ = 24437160. Its totient is φ = 4088320.

The previous prime is 10221397. The next prime is 10221443. The reversal of 10221440 is 4412201.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221443) 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 3 ways as a sum of consecutive naturals, for example, 7346 + ... + 8625.

Almost surely, 2^10221440 is an apocalyptic number.

10221440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10221440 is an abundant number, since it is smaller than the sum of its proper divisors (14215720).

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

10221440 is an equidigital number, since it uses as much as digits as its factorization.

10221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15990 (or 15978 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 10221440 is about 3197.0986847453. The cubic root of 10221440 is about 217.0221331314.

Adding to 10221440 its reverse (4412201), we get a palindrome (14633641).

The spelling of 10221440 in words is "ten million, two hundred twenty-one thousand, four hundred forty".