212020021121111 has 4 divisors (see below), whose sum is σ = 242308595566992. Its totient is φ = 181731446675232.

The previous prime is 212020021121093. The next prime is 212020021121123. The reversal of 212020021121111 is 111121120020212.

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 212020021121111 - 2¹⁰ = 212020021120087 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 212020021121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020021121611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15144287222930 + ... + 15144287222943.

It is an arithmetic number, because the mean of its divisors is an integer number (60577148891748).

Almost surely, 2^{212020021121111} is an apocalyptic number.

212020021121111 is a deficient number, since it is larger than the sum of its proper divisors (30288574445881).

212020021121111 is an equidigital number, since it uses as much as digits as its factorization.

212020021121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30288574445880.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212020021121111 its reverse (111121120020212), we get a palindrome (323141141141323).

The spelling of 212020021121111 in words is "two hundred twelve trillion, twenty billion, twenty-one million, one hundred twenty-one thousand, one hundred eleven".