1321311222000 has 1920 divisors, whose sum is σ = 6063331921920. Its totient is φ = 260029440000.

The previous prime is 1321311221987. The next prime is 1321311222029. The reversal of 1321311222000 is 2221131231.

1321311222000 is a `hidden beast` number, since 132 + 1 + 311 + 2 + 220 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 5769917886 + ... + 5769918114.

It is an arithmetic number, because the mean of its divisors is an integer number (3157985376).

Almost surely, 2^{1321311222000} is an apocalyptic number.

1321311222000 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 1321311222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3031665960960).

1321311222000 is an abundant number, since it is smaller than the sum of its proper divisors (4742020699920).

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

1321311222000 is a wasteful number, since it uses less digits than its factorization.

1321311222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1321311222000 its reverse (2221131231), we get a palindrome (1323532353231).

The spelling of 1321311222000 in words is "one trillion, three hundred twenty-one billion, three hundred eleven million, two hundred twenty-two thousand".