1231120430320 has 40 divisors (see below), whose sum is σ = 3122569093680. Its totient is φ = 447680156160.

The previous prime is 1231120430249. The next prime is 1231120430377. The reversal of 1231120430320 is 230340211321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 1231120430291 and 1231120430300.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 699499365 + ... + 699501124.

It is an arithmetic number, because the mean of its divisors is an integer number (78064227342).

Almost surely, 2^{1231120430320} is an apocalyptic number.

1231120430320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231120430320 is an abundant number, since it is smaller than the sum of its proper divisors (1891448663360).

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

1231120430320 is a wasteful number, since it uses less digits than its factorization.

1231120430320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399000513 (or 1399000507 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 1231120430320 its reverse (230340211321), we get a palindrome (1461460641641).

The spelling of 1231120430320 in words is "one trillion, two hundred thirty-one billion, one hundred twenty million, four hundred thirty thousand, three hundred twenty".