1321212320000 has 90 divisors (see below), whose sum is σ = 3295525061598. Its totient is φ = 528484864000.

The previous prime is 1321212319991. The next prime is 1321212320003. The reversal of 1321212320000 is 232121231.

It can be written as a sum of positive squares in 5 ways, for example, as 845487606016 + 475724713984 = 919504^2 + 689728^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321212320003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3968789 + ... + 4288788.

Almost surely, 2^{1321212320000} is an apocalyptic number.

1321212320000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321212320000 is an abundant number, since it is smaller than the sum of its proper divisors (1974312741598).

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

1321212320000 is an frugal number, since it uses more digits than its factorization.

1321212320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8257613 (or 8257584 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1321212320000 its reverse (232121231), we get a palindrome (1321444441231).

The spelling of 1321212320000 in words is "one trillion, three hundred twenty-one billion, two hundred twelve million, three hundred twenty thousand".