121320221133320 has 128 divisors (see below), whose sum is σ = 302030526401280. Its totient is φ = 43487832192000.

The previous prime is 121320221133289. The next prime is 121320221133359. The reversal of 121320221133320 is 23331122023121.

It is a self number, because there is not a number n which added to its sum of digits gives 121320221133320.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 188774930 + ... + 189416510.

It is an arithmetic number, because the mean of its divisors is an integer number (2359613487510).

Almost surely, 2^{121320221133320} is an apocalyptic number.

121320221133320 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 121320221133320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151015263200640).

121320221133320 is an abundant number, since it is smaller than the sum of its proper divisors (180710305267960).

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

121320221133320 is a wasteful number, since it uses less digits than its factorization.

121320221133320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647727 (or 647723 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 121320221133320 its reverse (23331122023121), we get a palindrome (144651343156441).

The spelling of 121320221133320 in words is "one hundred twenty-one trillion, three hundred twenty billion, two hundred twenty-one million, one hundred thirty-three thousand, three hundred twenty".