1211200021017 has 24 divisors (see below), whose sum is σ = 2086373537664. Its totient is φ = 662022370944.

The previous prime is 1211200020977. The next prime is 1211200021019. The reversal of 1211200021017 is 7101200021121.

It is not a de Polignac number, because 1211200021017 - 2¹⁰ = 1211200019993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211200021019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 417941968 + ... + 417944865.

It is an arithmetic number, because the mean of its divisors is an integer number (86932230736).

Almost surely, 2^{1211200021017} is an apocalyptic number.

It is an amenable number.

1211200021017 is a deficient number, since it is larger than the sum of its proper divisors (875173516647).

1211200021017 is a wasteful number, since it uses less digits than its factorization.

1211200021017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835886869 (or 835886866 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

Adding to 1211200021017 its reverse (7101200021121), we get a palindrome (8312400042138).

The spelling of 1211200021017 in words is "one trillion, two hundred eleven billion, two hundred million, twenty-one thousand, seventeen".