212101110221111 has 4 divisors (see below), whose sum is σ = 217274308031424. Its totient is φ = 206927912410800.

The previous prime is 212101110221107. The next prime is 212101110221213. The reversal of 212101110221111 is 111122011101212.

212101110221111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212101110221111 - 2² = 212101110221107 is a prime.

It is a super-4 number, since 4×212101110221111⁴ (a number of 58 digits) contains 4444 as substring.

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 212101110221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101110229111) 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, 2586598905095 + ... + 2586598905176.

It is an arithmetic number, because the mean of its divisors is an integer number (54318577007856).

Almost surely, 2^{212101110221111} is an apocalyptic number.

212101110221111 is a deficient number, since it is larger than the sum of its proper divisors (5173197810313).

212101110221111 is an equidigital number, since it uses as much as digits as its factorization.

212101110221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5173197810312.

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

Adding to 212101110221111 its reverse (111122011101212), we get a palindrome (323223121322323).

The spelling of 212101110221111 in words is "two hundred twelve trillion, one hundred one billion, one hundred ten million, two hundred twenty-one thousand, one hundred eleven".