1231321021320 has 128 divisors (see below), whose sum is σ = 3978453024000. Its totient is φ = 303068580864.

The previous prime is 1231321021291. The next prime is 1231321021421. The reversal of 1231321021320 is 231201231321.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23606389 + ... + 23658491.

It is an arithmetic number, because the mean of its divisors is an integer number (31081664250).

Almost surely, 2^{1231321021320} is an apocalyptic number.

1231321021320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231321021320 is an abundant number, since it is smaller than the sum of its proper divisors (2747132002680).

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

1231321021320 is a wasteful number, since it uses less digits than its factorization.

1231321021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67279 (or 67275 counting only the distinct ones).

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

Adding to 1231321021320 its reverse (231201231321), we get a palindrome (1462522252641).

The spelling of 1231321021320 in words is "one trillion, two hundred thirty-one billion, three hundred twenty-one million, twenty-one thousand, three hundred twenty".