1211200021004 has 6 divisors (see below), whose sum is σ = 2119600036764. Its totient is φ = 605600010500.

The previous prime is 1211200020977. The next prime is 1211200021019. The reversal of 1211200021004 is 4001200021121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211200021004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151400002622 + ... + 151400002629.

It is an arithmetic number, because the mean of its divisors is an integer number (353266672794).

Almost surely, 2^{1211200021004} is an apocalyptic number.

It is an amenable number.

1211200021004 is a deficient number, since it is larger than the sum of its proper divisors (908400015760).

1211200021004 is a wasteful number, since it uses less digits than its factorization.

1211200021004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302800005255 (or 302800005253 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1211200021004 its reverse (4001200021121), we get a palindrome (5212400042125).

The spelling of 1211200021004 in words is "one trillion, two hundred eleven billion, two hundred million, twenty-one thousand, four".