1121558543721 has 128 divisors (see below), whose sum is σ = 2116050739200. Its totient is φ = 570172711680.

The previous prime is 1121558543659. The next prime is 1121558543759. The reversal of 1121558543721 is 1273458551211.

1121558543721 is a `hidden beast` number, since 1 + 1 + 2 + 1 + 5 + 585 + 43 + 7 + 21 = 666.

It is not a de Polignac number, because 1121558543721 - 2⁷ = 1121558543593 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1121558543761) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 43731420 + ... + 43757058.

It is an arithmetic number, because the mean of its divisors is an integer number (16531646400).

Almost surely, 2^{1121558543721} is an apocalyptic number.

1121558543721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121558543721 is a deficient number, since it is larger than the sum of its proper divisors (994492195479).

1121558543721 is a wasteful number, since it uses less digits than its factorization.

1121558543721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26116 (or 26110 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The spelling of 1121558543721 in words is "one trillion, one hundred twenty-one billion, five hundred fifty-eight million, five hundred forty-three thousand, seven hundred twenty-one".