212021212986 has 128 divisors (see below), whose sum is σ = 555806085120. Its totient is φ = 59182790400.

The previous prime is 212021212981. The next prime is 212021212993. The reversal of 212021212986 is 689212120212.

It is a self number, because there is not a number n which added to its sum of digits gives 212021212986.

It is not an unprimeable number, because it can be changed into a prime (212021212981) 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 63 ways as a sum of consecutive naturals, for example, 251241 + ... + 697971.

It is an arithmetic number, because the mean of its divisors is an integer number (4342235040).

Almost surely, 2^212021212986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212021212986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277903042560).

212021212986 is an abundant number, since it is smaller than the sum of its proper divisors (343784872134).

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

212021212986 is a wasteful number, since it uses less digits than its factorization.

212021212986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446817 (or 446811 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 212021212986 in words is "two hundred twelve billion, twenty-one million, two hundred twelve thousand, nine hundred eighty-six".