212105054056 has 128 divisors (see below), whose sum is σ = 485185075200. Its totient is φ = 84962592000.

The previous prime is 212105054009. The next prime is 212105054071. The reversal of 212105054056 is 650450501212.

It is a super-2 number, since 2×212105054056² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17128075 + ... + 17140453.

It is an arithmetic number, because the mean of its divisors is an integer number (3790508400).

Almost surely, 2^212105054056 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 212105054056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242592537600).

212105054056 is an abundant number, since it is smaller than the sum of its proper divisors (273080021144).

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

212105054056 is a wasteful number, since it uses less digits than its factorization.

212105054056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12719 (or 12715 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 212105054056 its reverse (650450501212), we get a palindrome (862555555268).

The spelling of 212105054056 in words is "two hundred twelve billion, one hundred five million, fifty-four thousand, fifty-six".