20212011211111 has 4 divisors (see below), whose sum is σ = 20496687425424. Its totient is φ = 19927334996800.

The previous prime is 20212011211097. The next prime is 20212011211121. The reversal of 20212011211111 is 11111211021202.

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 20212011211111 - 2¹⁵ = 20212011178343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212011211121) 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, 142338107050 + ... + 142338107191.

It is an arithmetic number, because the mean of its divisors is an integer number (5124171856356).

Almost surely, 2^{20212011211111} is an apocalyptic number.

20212011211111 is a deficient number, since it is larger than the sum of its proper divisors (284676214313).

20212011211111 is an equidigital number, since it uses as much as digits as its factorization.

20212011211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284676214312.

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

Adding to 20212011211111 its reverse (11111211021202), we get a palindrome (31323222232313).

The spelling of 20212011211111 in words is "twenty trillion, two hundred twelve billion, eleven million, two hundred eleven thousand, one hundred eleven".