8210991212406 has 96 divisors (see below), whose sum is σ = 18433488172320. Its totient is φ = 2638379520000.

The previous prime is 8210991212393. The next prime is 8210991212423. The reversal of 8210991212406 is 6042121990128.

It is a happy number.

8210991212406 is a `hidden beast` number, since 8 + 21 + 0 + 9 + 9 + 1 + 212 + 406 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1042926486 + ... + 1042934358.

It is an arithmetic number, because the mean of its divisors is an integer number (192015501795).

Almost surely, 2^{8210991212406} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8210991212406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9216744086160).

8210991212406 is an abundant number, since it is smaller than the sum of its proper divisors (10222496959914).

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

8210991212406 is a wasteful number, since it uses less digits than its factorization.

8210991212406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10862 (or 10859 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 8210991212406 in words is "eight trillion, two hundred ten billion, nine hundred ninety-one million, two hundred twelve thousand, four hundred six".