1323213121320 has 64 divisors (see below), whose sum is σ = 4203147568320. Its totient is φ = 332100547584.

The previous prime is 1323213121291. The next prime is 1323213121361. The reversal of 1323213121320 is 231213123231.

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

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 15 ways as a sum of consecutive naturals, for example, 324314902 + ... + 324318981.

It is an arithmetic number, because the mean of its divisors is an integer number (65674180755).

Almost surely, 2^{1323213121320} is an apocalyptic number.

1323213121320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1323213121320 is an abundant number, since it is smaller than the sum of its proper divisors (2879934447000).

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

1323213121320 is a wasteful number, since it uses less digits than its factorization.

1323213121320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648633914 (or 648633910 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 1323213121320 its reverse (231213123231), we get a palindrome (1554426244551).

The spelling of 1323213121320 in words is "one trillion, three hundred twenty-three billion, two hundred thirteen million, one hundred twenty-one thousand, three hundred twenty".