13121323221000 has 512 divisors, whose sum is σ = 45046849536000. Its totient is φ = 3167289216000.

The previous prime is 13121323220983. The next prime is 13121323221037. The reversal of 13121323221000 is 12232312131.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 139546002 + ... + 139639998.

It is an arithmetic number, because the mean of its divisors is an integer number (87982128000).

Almost surely, 2^{13121323221000} is an apocalyptic number.

13121323221000 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 13121323221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22523424768000).

13121323221000 is an abundant number, since it is smaller than the sum of its proper divisors (31925526315000).

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

13121323221000 is a wasteful number, since it uses less digits than its factorization.

13121323221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94150 (or 94136 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 13121323221000 its reverse (12232312131), we get a palindrome (13133555533131).

The spelling of 13121323221000 in words is "thirteen trillion, one hundred twenty-one billion, three hundred twenty-three million, two hundred twenty-one thousand".