1218313021996 has 96 divisors (see below), whose sum is σ = 2504837833344. Its totient is φ = 507610368000.

The previous prime is 1218313021957. The next prime is 1218313021999. The reversal of 1218313021996 is 6991203138121.

It is not an unprimeable number, because it can be changed into a prime (1218313021999) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 654654106 + ... + 654655966.

It is an arithmetic number, because the mean of its divisors is an integer number (26092060764).

Almost surely, 2^{1218313021996} 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 1218313021996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1252418916672).

1218313021996 is an abundant number, since it is smaller than the sum of its proper divisors (1286524811348).

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

1218313021996 is a wasteful number, since it uses less digits than its factorization.

1218313021996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3611 (or 3609 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The spelling of 1218313021996 in words is "one trillion, two hundred eighteen billion, three hundred thirteen million, twenty-one thousand, nine hundred ninety-six".