9212115649840 has 80 divisors (see below), whose sum is σ = 21648850697376. Its totient is φ = 3645221888000.

The previous prime is 9212115649817. The next prime is 9212115649879. The reversal of 9212115649840 is 489465112129.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 8906880 + ... + 9887200.

Almost surely, 2^{9212115649840} 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 9212115649840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10824425348688).

9212115649840 is an abundant number, since it is smaller than the sum of its proper divisors (12436735047536).

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

9212115649840 is a wasteful number, since it uses less digits than its factorization.

9212115649840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981598 (or 981592 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 9212115649840 in words is "nine trillion, two hundred twelve billion, one hundred fifteen million, six hundred forty-nine thousand, eight hundred forty".