121211200011 has 16 divisors (see below), whose sum is σ = 176337964800. Its totient is φ = 73448514720.

The previous prime is 121211199983. The next prime is 121211200039. The reversal of 121211200011 is 110002112121.

It is an interprime number because it is at equal distance from previous prime (121211199983) and next prime (121211200039).

It is not a de Polignac number, because 121211200011 - 2¹⁷ = 121211068939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121211200011.

It is not an unprimeable number, because it can be changed into a prime (121211200051) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 126736 + ... + 508413.

It is an arithmetic number, because the mean of its divisors is an integer number (11021122800).

Almost surely, 2^121211200011 is an apocalyptic number.

121211200011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121211200011 is a deficient number, since it is larger than the sum of its proper divisors (55126764789).

121211200011 is a wasteful number, since it uses less digits than its factorization.

121211200011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640946.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121211200011 its reverse (110002112121), we get a palindrome (231213312132).

The spelling of 121211200011 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred thousand, eleven".