121211201200111 has 16 divisors (see below), whose sum is σ = 139797712310400. Its totient is φ = 103936559940000.

The previous prime is 121211201200051. The next prime is 121211201200189. The reversal of 121211201200111 is 111002102112121.

It is not a de Polignac number, because 121211201200111 - 2⁷ = 121211201199983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211201210111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1266235765 + ... + 1266331486.

It is an arithmetic number, because the mean of its divisors is an integer number (8737357019400).

Almost surely, 2^{121211201200111} is an apocalyptic number.

121211201200111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121211201200111 is a deficient number, since it is larger than the sum of its proper divisors (18586511110289).

121211201200111 is a wasteful number, since it uses less digits than its factorization.

121211201200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532567510.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 121211201200111 its reverse (111002102112121), we get a palindrome (232213303312232).

The spelling of 121211201200111 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred one million, two hundred thousand, one hundred eleven".