1321231230156 has 12 divisors (see below), whose sum is σ = 3082872870392. Its totient is φ = 440410410048.

The previous prime is 1321231230107. The next prime is 1321231230157. The reversal of 1321231230156 is 6510321321231.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1321231230157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55051301245 + ... + 55051301268.

Almost surely, 2^{1321231230156} is an apocalyptic number.

It is an amenable number.

1321231230156 is an abundant number, since it is smaller than the sum of its proper divisors (1761641640236).

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

1321231230156 is a wasteful number, since it uses less digits than its factorization.

1321231230156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110102602520 (or 110102602518 counting only the distinct ones).

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

Adding to 1321231230156 its reverse (6510321321231), we get a palindrome (7831552551387).

The spelling of 1321231230156 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred thirty thousand, one hundred fifty-six".