211212301211111 has 4 divisors (see below), whose sum is σ = 211212712636800. Its totient is φ = 211211889785424.

The previous prime is 211212301211059. The next prime is 211212301211173. The reversal of 211212301211111 is 111112103212112.

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 211212301211111 - 2⁴⁶ = 140843557033447 is a prime.

It is a super-2 number, since 2×211212301211111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212301214111) 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 3 ways as a sum of consecutive naturals, for example, 204941831 + ... + 205969848.

It is an arithmetic number, because the mean of its divisors is an integer number (52803178159200).

Almost surely, 2^{211212301211111} is an apocalyptic number.

211212301211111 is a deficient number, since it is larger than the sum of its proper divisors (411425689).

211212301211111 is an equidigital number, since it uses as much as digits as its factorization.

211212301211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411425688.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 211212301211111 its reverse (111112103212112), we get a palindrome (322324404423223).

The spelling of 211212301211111 in words is "two hundred eleven trillion, two hundred twelve billion, three hundred one million, two hundred eleven thousand, one hundred eleven".