1321121250000 has 480 divisors, whose sum is σ = 4730830076544. Its totient is φ = 343980000000.

The previous prime is 1321121249999. The next prime is 1321121250013. The reversal of 1321121250000 is 521211231.

1321121250000 is a `hidden beast` number, since 132 + 11 + 21 + 2 + 500 + 0 + 0 = 666.

It is a super-2 number, since 2×1321121250000² (a number of 25 digits) contains 22 as substring.

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 95 ways as a sum of consecutive naturals, for example, 483748635 + ... + 483751365.

Almost surely, 2^{1321121250000} is an apocalyptic number.

1321121250000 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 1321121250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2365415038272).

1321121250000 is an abundant number, since it is smaller than the sum of its proper divisors (3409708826544).

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

1321121250000 is an frugal number, since it uses more digits than its factorization.

1321121250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823 (or 2784 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 1321121250000 its reverse (521211231), we get a palindrome (1321642461231).

The spelling of 1321121250000 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-one million, two hundred fifty thousand".