212101122221112 has 128 divisors (see below), whose sum is σ = 566550886809600. Its totient is φ = 66023229081600.

The previous prime is 212101122221101. The next prime is 212101122221137. The reversal of 212101122221112 is 211122221101212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35574537 + ... + 41106567.

It is an arithmetic number, because the mean of its divisors is an integer number (4426178803200).

Almost surely, 2^{212101122221112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212101122221112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283275443404800).

212101122221112 is an abundant number, since it is smaller than the sum of its proper divisors (354449764588488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212101122221112 is a wasteful number, since it uses less digits than its factorization.

212101122221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5533877 (or 5533873 counting only the distinct ones).

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

Adding to 212101122221112 its reverse (211122221101212), we get a palindrome (423223343322324).

The spelling of 212101122221112 in words is "two hundred twelve trillion, one hundred one billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred twelve".