212101122021111 has 80 divisors (see below), whose sum is σ = 322162834076160. Its totient is φ = 139038343741440.

The previous prime is 212101122021097. The next prime is 212101122021119. The reversal of 212101122021111 is 111120221101212.

It is a happy number.

212101122021111 is a `hidden beast` number, since 2 + 1 + 210 + 11 + 220 + 211 + 11 = 666.

212101122021111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 212101122021111 - 2²⁹ = 212100585150199 is a prime.

It is a super-2 number, since 2×212101122021111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212101122021119) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13527712170 + ... + 13527727848.

It is an arithmetic number, because the mean of its divisors is an integer number (4027035425952).

Almost surely, 2^{212101122021111} is an apocalyptic number.

212101122021111 is a deficient number, since it is larger than the sum of its proper divisors (110061712055049).

212101122021111 is a wasteful number, since it uses less digits than its factorization.

212101122021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22598 (or 22589 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 212101122021111 its reverse (111120221101212), we get a palindrome (323221343122323).

The spelling of 212101122021111 in words is "two hundred twelve trillion, one hundred one billion, one hundred twenty-two million, twenty-one thousand, one hundred eleven".