1231303120320 has 672 divisors, whose sum is σ = 4876656427008. Its totient is φ = 257715634176.

The previous prime is 1231303120301. The next prime is 1231303120403. The reversal of 1231303120320 is 230213031321.

It is a tau number, because it is divible by the number of its divisors (672).

It is a super-2 number, since 2×1231303120320² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 144227092 + ... + 144235628.

Almost surely, 2^{1231303120320} is an apocalyptic number.

1231303120320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231303120320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2438328213504).

1231303120320 is an abundant number, since it is smaller than the sum of its proper divisors (3645353306688).

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

1231303120320 is a wasteful number, since it uses less digits than its factorization.

1231303120320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8717 (or 8694 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 1231303120320 its reverse (230213031321), we get a palindrome (1461516151641).

The spelling of 1231303120320 in words is "one trillion, two hundred thirty-one billion, three hundred three million, one hundred twenty thousand, three hundred twenty".