212121212101111 has 8 divisors (see below), whose sum is σ = 212191356667904. Its totient is φ = 212051074639320.

The previous prime is 212121212101091. The next prime is 212121212101157. The reversal of 212121212101111 is 111101212121212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212121212101111 - 2¹¹ = 212121212099063 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 (212121212101411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58279366 + ... + 61812028.

It is an arithmetic number, because the mean of its divisors is an integer number (26523919583488).

Almost surely, 2^{212121212101111} is an apocalyptic number.

212121212101111 is a deficient number, since it is larger than the sum of its proper divisors (70144566793).

212121212101111 is a wasteful number, since it uses less digits than its factorization.

212121212101111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3552501.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 212121212101111 its reverse (111101212121212), we get a palindrome (323222424222323).

The spelling of 212121212101111 in words is "two hundred twelve trillion, one hundred twenty-one billion, two hundred twelve million, one hundred one thousand, one hundred eleven".