212100111212111 has 4 divisors (see below), whose sum is σ = 212100150397800. Its totient is φ = 212100072026424.

The previous prime is 212100111212107. The next prime is 212100111212147. The reversal of 212100111212111 is 111212111001212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212100111212111 - 2² = 212100111212107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212100111212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100111214111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9863276 + ... + 22836033.

It is an arithmetic number, because the mean of its divisors is an integer number (53025037599450).

Almost surely, 2^{212100111212111} is an apocalyptic number.

212100111212111 is a deficient number, since it is larger than the sum of its proper divisors (39185689).

212100111212111 is an equidigital number, since it uses as much as digits as its factorization.

212100111212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39185688.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 212100111212111 its reverse (111212111001212), we get a palindrome (323312222213323).

The spelling of 212100111212111 in words is "two hundred twelve trillion, one hundred billion, one hundred eleven million, two hundred twelve thousand, one hundred eleven".