10991105412 has 24 divisors (see below), whose sum is σ = 29309614656. Its totient is φ = 3140315808.

The previous prime is 10991105407. The next prime is 10991105423. The reversal of 10991105412 is 21450119901.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65423163 + ... + 65423330.

It is an arithmetic number, because the mean of its divisors is an integer number (1221233944).

Almost surely, 2^10991105412 is an apocalyptic number.

10991105412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

10991105412 is an abundant number, since it is smaller than the sum of its proper divisors (18318509244).

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

10991105412 is a wasteful number, since it uses less digits than its factorization.

10991105412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130846507 (or 130846505 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 33.

It can be divided in two parts, 10991 and 105412, that added together give a triangular number (116403 = T₄₈₂).

The spelling of 10991105412 in words is "ten billion, nine hundred ninety-one million, one hundred five thousand, four hundred twelve".