1321326156 has 24 divisors (see below), whose sum is σ = 3264453360. Its totient is φ = 414533632.

The previous prime is 1321326109. The next prime is 1321326157. The reversal of 1321326156 is 6516231231.

It is not an unprimeable number, because it can be changed into a prime (1321326157) 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, 3238341 + ... + 3238748.

It is an arithmetic number, because the mean of its divisors is an integer number (136018890).

Almost surely, 2^1321326156 is an apocalyptic number.

It is an amenable number.

1321326156 is an abundant number, since it is smaller than the sum of its proper divisors (1943127204).

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

1321326156 is a wasteful number, since it uses less digits than its factorization.

1321326156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6477113 (or 6477111 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1321326156 is about 36350.0502888235. The cubic root of 1321326156 is about 1097.3285465774.

Adding to 1321326156 its reverse (6516231231), we get a palindrome (7837557387).

The spelling of 1321326156 in words is "one billion, three hundred twenty-one million, three hundred twenty-six thousand, one hundred fifty-six".