11211121201985 has 16 divisors (see below), whose sum is σ = 13487592115200. Its totient is φ = 8946067052736.

The previous prime is 11211121201979. The next prime is 11211121202009. The reversal of 11211121201985 is 58910212111211.

It is a cyclic number.

It is not a de Polignac number, because 11211121201985 - 2⁶ = 11211121201921 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143990696 + ... + 144068534.

It is an arithmetic number, because the mean of its divisors is an integer number (842974507200).

Almost surely, 2^{11211121201985} is an apocalyptic number.

It is an amenable number.

11211121201985 is a deficient number, since it is larger than the sum of its proper divisors (2276470913215).

11211121201985 is an equidigital number, since it uses as much as digits as its factorization.

11211121201985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150800.

The product of its (nonzero) digits is 2880, while the sum is 35.

The spelling of 11211121201985 in words is "eleven trillion, two hundred eleven billion, one hundred twenty-one million, two hundred one thousand, nine hundred eighty-five".