1131231211320 has 64 divisors (see below), whose sum is σ = 3878507013120. Its totient is φ = 258567133824.

The previous prime is 1131231211291. The next prime is 1131231211321. The reversal of 1131231211320 is 231121321311.

It is a super-2 number, since 2×1131231211320² (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 not an unprimeable number, because it can be changed into a prime (1131231211321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 673351072 + ... + 673352751.

It is an arithmetic number, because the mean of its divisors is an integer number (60601672080).

Almost surely, 2^{1131231211320} is an apocalyptic number.

1131231211320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131231211320 is an abundant number, since it is smaller than the sum of its proper divisors (2747275801800).

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

1131231211320 is a wasteful number, since it uses less digits than its factorization.

1131231211320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346703844 (or 1346703840 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1131231211320 its reverse (231121321311), we get a palindrome (1362352532631).

The spelling of 1131231211320 in words is "one trillion, one hundred thirty-one billion, two hundred thirty-one million, two hundred eleven thousand, three hundred twenty".