1121861797812 has 240 divisors, whose sum is σ = 3472142958592. Its totient is φ = 309090634560.

The previous prime is 1121861797807. The next prime is 1121861797841. The reversal of 1121861797812 is 2187971681211.

It is a happy number.

1121861797812 is a `hidden beast` number, since 1 + 1 + 2 + 1 + 8 + 617 + 9 + 7 + 8 + 12 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 19868973 + ... + 19925355.

Almost surely, 2^{1121861797812} is an apocalyptic number.

1121861797812 is a gapful number since it is divisible by the number (12) 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 1121861797812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1736071479296).

1121861797812 is an abundant number, since it is smaller than the sum of its proper divisors (2350281160780).

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

1121861797812 is a wasteful number, since it uses less digits than its factorization.

1121861797812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56720 (or 56709 counting only the distinct ones).

The product of its digits is 677376, while the sum is 54.

The spelling of 1121861797812 in words is "one trillion, one hundred twenty-one billion, eight hundred sixty-one million, seven hundred ninety-seven thousand, eight hundred twelve".