1155043020121 has 16 divisors (see below), whose sum is σ = 1182376787328. Its totient is φ = 1128047939200.

The previous prime is 1155043020049. The next prime is 1155043020127. The reversal of 1155043020121 is 1210203405511.

It is a cyclic number.

It is not a de Polignac number, because 1155043020121 - 2⁷ = 1155043019993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1155043020127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5069181 + ... + 5292133.

It is an arithmetic number, because the mean of its divisors is an integer number (73898549208).

Almost surely, 2^{1155043020121} is an apocalyptic number.

It is an amenable number.

1155043020121 is a deficient number, since it is larger than the sum of its proper divisors (27333767207).

1155043020121 is a wasteful number, since it uses less digits than its factorization.

1155043020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223712.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 1155043020121 its reverse (1210203405511), we get a palindrome (2365246425632).

The spelling of 1155043020121 in words is "one trillion, one hundred fifty-five billion, forty-three million, twenty thousand, one hundred twenty-one".