212120020021111 has 4 divisors (see below), whose sum is σ = 215715274597800. Its totient is φ = 208524765444424.

The previous prime is 212120020021099. The next prime is 212120020021127. The reversal of 212120020021111 is 111120020021212.

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 212120020021111 - 2⁷ = 212120020020983 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 (212120020021211) 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, 1797627288256 + ... + 1797627288373.

It is an arithmetic number, because the mean of its divisors is an integer number (53928818649450).

Almost surely, 2^{212120020021111} is an apocalyptic number.

212120020021111 is a deficient number, since it is larger than the sum of its proper divisors (3595254576689).

212120020021111 is an equidigital number, since it uses as much as digits as its factorization.

212120020021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3595254576688.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212120020021111 its reverse (111120020021212), we get a palindrome (323240040042323).

The spelling of 212120020021111 in words is "two hundred twelve trillion, one hundred twenty billion, twenty million, twenty-one thousand, one hundred eleven".