1221322323000 has 256 divisors, whose sum is σ = 4105304985600. Its totient is φ = 300511449600.

The previous prime is 1221322322999. The next prime is 1221322323007. The reversal of 1221322323000 is 3232231221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221322323007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 130996339 + ... + 131005661.

It is an arithmetic number, because the mean of its divisors is an integer number (16036347600).

Almost surely, 2^{1221322323000} is an apocalyptic number.

1221322323000 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 1221322323000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2052652492800).

1221322323000 is an abundant number, since it is smaller than the sum of its proper divisors (2883982662600).

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

1221322323000 is a wasteful number, since it uses less digits than its factorization.

1221322323000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12719 (or 12705 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 1221322323000 its reverse (3232231221), we get a palindrome (1224554554221).

The spelling of 1221322323000 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-two million, three hundred twenty-three thousand".