10991220396 has 96 divisors (see below), whose sum is σ = 29113244160. Its totient is φ = 3199440384.

The previous prime is 10991220379. The next prime is 10991220403. The reversal of 10991220396 is 69302219901.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2537985 + ... + 2542311.

It is an arithmetic number, because the mean of its divisors is an integer number (303262960).

Almost surely, 2^10991220396 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 10991220396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14556622080).

10991220396 is an abundant number, since it is smaller than the sum of its proper divisors (18122023764).

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

10991220396 is a wasteful number, since it uses less digits than its factorization.

10991220396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223 (or 5221 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The spelling of 10991220396 in words is "ten billion, nine hundred ninety-one million, two hundred twenty thousand, three hundred ninety-six".