1326221560 has 32 divisors (see below), whose sum is σ = 3047492160. Its totient is φ = 519200896.

The previous prime is 1326221551. The next prime is 1326221569. The reversal of 1326221560 is 651226231.

It is an interprime number because it is at equal distance from previous prime (1326221551) and next prime (1326221569).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1326221569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350839 + ... + 354598.

It is an arithmetic number, because the mean of its divisors is an integer number (95234130).

Almost surely, 2^1326221560 is an apocalyptic number.

1326221560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1326221560 is an abundant number, since it is smaller than the sum of its proper divisors (1721270600).

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

1326221560 is a wasteful number, since it uses less digits than its factorization.

1326221560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705495 (or 705491 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1326221560 is about 36417.3249978633. The cubic root of 1326221560 is about 1098.6820468837.

Adding to 1326221560 its reverse (651226231), we get a palindrome (1977447791).

The spelling of 1326221560 in words is "one billion, three hundred twenty-six million, two hundred twenty-one thousand, five hundred sixty".