1131321294820 has 96 divisors (see below), whose sum is σ = 2557308644352. Its totient is φ = 418856030208.

The previous prime is 1131321294797. The next prime is 1131321294821. The reversal of 1131321294820 is 284921231311.

It is a super-2 number, since 2×1131321294820² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1131321294820.

It is not an unprimeable number, because it can be changed into a prime (1131321294821) 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 31 ways as a sum of consecutive naturals, for example, 13786552 + ... + 13868368.

It is an arithmetic number, because the mean of its divisors is an integer number (26638631712).

Almost surely, 2^{1131321294820} is an apocalyptic number.

1131321294820 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 1131321294820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278654322176).

1131321294820 is an abundant number, since it is smaller than the sum of its proper divisors (1425987349532).

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

1131321294820 is a wasteful number, since it uses less digits than its factorization.

1131321294820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82517 (or 82515 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 1131321294820 in words is "one trillion, one hundred thirty-one billion, three hundred twenty-one million, two hundred ninety-four thousand, eight hundred twenty".