1326221616 has 20 divisors (see below), whose sum is σ = 3426072632. Its totient is φ = 442073856.

The previous prime is 1326221581. The next prime is 1326221621. The reversal of 1326221616 is 6161226231.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13814761 + ... + 13814856.

Almost surely, 2^1326221616 is an apocalyptic number.

1326221616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1326221616 is an abundant number, since it is smaller than the sum of its proper divisors (2099851016).

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

1326221616 is a wasteful number, since it uses less digits than its factorization.

1326221616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27629628 (or 27629622 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 1326221616 is about 36417.3257667281. The cubic root of 1326221616 is about 1098.6820623478.

Adding to 1326221616 its reverse (6161226231), we get a palindrome (7487447847).

The spelling of 1326221616 in words is "one billion, three hundred twenty-six million, two hundred twenty-one thousand, six hundred sixteen".