212100221001111 has 4 divisors (see below), whose sum is σ = 282800294668152. Its totient is φ = 141400147334072.

The previous prime is 212100221001079. The next prime is 212100221001181. The reversal of 212100221001111 is 111100122001212.

It is a happy number.

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 212100221001111 - 2⁵ = 212100221001079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212100221001181) 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, 35350036833516 + ... + 35350036833521.

It is an arithmetic number, because the mean of its divisors is an integer number (70700073667038).

Almost surely, 2^{212100221001111} is an apocalyptic number.

212100221001111 is a deficient number, since it is larger than the sum of its proper divisors (70700073667041).

212100221001111 is an equidigital number, since it uses as much as digits as its factorization.

212100221001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70700073667040.

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

Adding to 212100221001111 its reverse (111100122001212), we get a palindrome (323200343002323).

The spelling of 212100221001111 in words is "two hundred twelve trillion, one hundred billion, two hundred twenty-one million, one thousand, one hundred eleven".