1321213303320 has 128 divisors (see below), whose sum is σ = 4172736384000. Its totient is φ = 333741496320.

The previous prime is 1321213303313. The next prime is 1321213303327. The reversal of 1321213303320 is 233033121231.

It is an interprime number because it is at equal distance from previous prime (1321213303313) and next prime (1321213303327).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321213303327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23134000 + ... + 23191040.

It is an arithmetic number, because the mean of its divisors is an integer number (32599503000).

Almost surely, 2^{1321213303320} is an apocalyptic number.

1321213303320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321213303320 is an abundant number, since it is smaller than the sum of its proper divisors (2851523080680).

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

1321213303320 is a wasteful number, since it uses less digits than its factorization.

1321213303320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67233 (or 67229 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 1321213303320 its reverse (233033121231), we get a palindrome (1554246424551).

The spelling of 1321213303320 in words is "one trillion, three hundred twenty-one billion, two hundred thirteen million, three hundred three thousand, three hundred twenty".