1320121313220 has 48 divisors (see below), whose sum is σ = 3697001739648. Its totient is φ = 351969296640.

The previous prime is 1320121313179. The next prime is 1320121313227. The reversal of 1320121313220 is 223131210231.

It is not an unprimeable number, because it can be changed into a prime (1320121313227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1632169 + ... + 2303088.

It is an arithmetic number, because the mean of its divisors is an integer number (77020869576).

Almost surely, 2^{1320121313220} is an apocalyptic number.

1320121313220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320121313220 is an abundant number, since it is smaller than the sum of its proper divisors (2376880426428).

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

1320121313220 is a wasteful number, since it uses less digits than its factorization.

1320121313220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940860 (or 3940858 counting only the distinct ones).

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

Adding to 1320121313220 its reverse (223131210231), we get a palindrome (1543252523451).

The spelling of 1320121313220 in words is "one trillion, three hundred twenty billion, one hundred twenty-one million, three hundred thirteen thousand, two hundred twenty".