1012221320 has 64 divisors (see below), whose sum is σ = 2488631040. Its totient is φ = 367475200.

The previous prime is 1012221317. The next prime is 1012221367. The reversal of 1012221320 is 231222101.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1012221295 and 1012221304.

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, 333329 + ... + 336351.

It is an arithmetic number, because the mean of its divisors is an integer number (38884860).

Almost surely, 2^1012221320 is an apocalyptic number.

1012221320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1012221320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1244315520).

1012221320 is an abundant number, since it is smaller than the sum of its proper divisors (1476409720).

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

1012221320 is a wasteful number, since it uses less digits than its factorization.

1012221320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806 (or 3802 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1012221320 is about 31815.4258183039. The cubic root of 1012221320 is about 1004.0572894723.

Adding to 1012221320 its reverse (231222101), we get a palindrome (1243443421).

The spelling of 1012221320 in words is "one billion, twelve million, two hundred twenty-one thousand, three hundred twenty".