212220212121111 has 4 divisors (see below), whose sum is σ = 282960282828152. Its totient is φ = 141480141414072.

The previous prime is 212220212121091. The next prime is 212220212121119. The reversal of 212220212121111 is 111121212022212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212220212121111 - 2¹¹ = 212220212119063 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 (212220212121119) 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, 35370035353516 + ... + 35370035353521.

It is an arithmetic number, because the mean of its divisors is an integer number (70740070707038).

Almost surely, 2^{212220212121111} is an apocalyptic number.

212220212121111 is a deficient number, since it is larger than the sum of its proper divisors (70740070707041).

212220212121111 is an equidigital number, since it uses as much as digits as its factorization.

212220212121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70740070707040.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 212220212121111 its reverse (111121212022212), we get a palindrome (323341424143323).

The spelling of 212220212121111 in words is "two hundred twelve trillion, two hundred twenty billion, two hundred twelve million, one hundred twenty-one thousand, one hundred eleven".