1121023781787 has 256 divisors, whose sum is σ = 2066677760000. Its totient is φ = 534957696000.

The previous prime is 1121023781771. The next prime is 1121023781797. The reversal of 1121023781787 is 7871873201211.

It is not a de Polignac number, because 1121023781787 - 2⁴ = 1121023781771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1121023781707) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 622444287 + ... + 622446087.

It is an arithmetic number, because the mean of its divisors is an integer number (8072960000).

Almost surely, 2^{1121023781787} is an apocalyptic number.

1121023781787 is a deficient number, since it is larger than the sum of its proper divisors (945653978213).

1121023781787 is a wasteful number, since it uses less digits than its factorization.

1121023781787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967 (or 1953 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 48.

Adding to 1121023781787 its reverse (7871873201211), we get a palindrome (8992896982998).

The spelling of 1121023781787 in words is "one trillion, one hundred twenty-one billion, twenty-three million, seven hundred eighty-one thousand, seven hundred eighty-seven".