212020021111 has 4 divisors (see below), whose sum is σ = 215495759224. Its totient is φ = 208544283000.

The previous prime is 212020021091. The next prime is 212020021159. The reversal of 212020021111 is 111120020212.

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 212020021111 - 2²¹ = 212017923959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212020021091 and 212020021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020061111) 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, 1737868965 + ... + 1737869086.

It is an arithmetic number, because the mean of its divisors is an integer number (53873939806).

Almost surely, 2^212020021111 is an apocalyptic number.

212020021111 is a deficient number, since it is larger than the sum of its proper divisors (3475738113).

212020021111 is an equidigital number, since it uses as much as digits as its factorization.

212020021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3475738112.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212020021111 its reverse (111120020212), we get a palindrome (323140041323).

The spelling of 212020021111 in words is "two hundred twelve billion, twenty million, twenty-one thousand, one hundred eleven".