200121201111111 has 32 divisors (see below), whose sum is σ = 310865437529088. Its totient is φ = 112146530711040.

The previous prime is 200121201111101. The next prime is 200121201111149. The reversal of 200121201111111 is 111111102121002.

It is not a de Polignac number, because 200121201111111 - 2²⁷ = 200121066893383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121201111101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231352635 + ... + 232216028.

It is an arithmetic number, because the mean of its divisors is an integer number (9714544922784).

Almost surely, 2^{200121201111111} is an apocalyptic number.

200121201111111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

200121201111111 is a deficient number, since it is larger than the sum of its proper divisors (110744236417977).

200121201111111 is a wasteful number, since it uses less digits than its factorization.

200121201111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463569071.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 200121201111111 its reverse (111111102121002), we get a palindrome (311232303232113).

The spelling of 200121201111111 in words is "two hundred trillion, one hundred twenty-one billion, two hundred one million, one hundred eleven thousand, one hundred eleven".