1321231324340 has 24 divisors (see below), whose sum is σ = 2821612661280. Its totient is φ = 519535028768.

The previous prime is 1321231324337. The next prime is 1321231324349. The reversal of 1321231324340 is 434231321231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321231324349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559842602 + ... + 559844961.

It is an arithmetic number, because the mean of its divisors is an integer number (117567194220).

Almost surely, 2^{1321231324340} is an apocalyptic number.

1321231324340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321231324340 is an abundant number, since it is smaller than the sum of its proper divisors (1500381336940).

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

1321231324340 is a wasteful number, since it uses less digits than its factorization.

1321231324340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119687631 (or 1119687629 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 1321231324340 its reverse (434231321231), we get a palindrome (1755462645571).

The spelling of 1321231324340 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, three hundred twenty-four thousand, three hundred forty".