1213522440000 has 560 divisors, whose sum is σ = 4330621857408. Its totient is φ = 298036224000.

The previous prime is 1213522439989. The next prime is 1213522440023. The reversal of 1213522440000 is 442253121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1368119557 + ... + 1368120443.

Almost surely, 2^{1213522440000} is an apocalyptic number.

1213522440000 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 1213522440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2165310928704).

1213522440000 is an abundant number, since it is smaller than the sum of its proper divisors (3117099417408).

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

1213522440000 is an equidigital number, since it uses as much as digits as its factorization.

1213522440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 1787 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 1213522440000 its reverse (442253121), we get a palindrome (1213964693121).

The spelling of 1213522440000 in words is "one trillion, two hundred thirteen billion, five hundred twenty-two million, four hundred forty thousand".