201211212111 has 32 divisors (see below), whose sum is σ = 341578728960. Its totient is φ = 102473610624.

The previous prime is 201211212077. The next prime is 201211212157. The reversal of 201211212111 is 111212112102.

It is a happy number.

It is not a de Polignac number, because 201211212111 - 2⁷ = 201211211983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211212511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12699625 + ... + 12715458.

It is an arithmetic number, because the mean of its divisors is an integer number (10674335280).

Almost surely, 2^201211212111 is an apocalyptic number.

201211212111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

201211212111 is a deficient number, since it is larger than the sum of its proper divisors (140367516849).

201211212111 is a wasteful number, since it uses less digits than its factorization.

201211212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25415135.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201211212111 its reverse (111212112102), we get a palindrome (312423324213).

The spelling of 201211212111 in words is "two hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred eleven".