21109291112 has 48 divisors (see below), whose sum is σ = 48981428640. Its totient is φ = 8350924608.

The previous prime is 21109291111. The next prime is 21109291117. The reversal of 21109291112 is 21119290112.

It is not an unprimeable number, because it can be changed into a prime (21109291111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1105778 + ... + 1124705.

It is an arithmetic number, because the mean of its divisors is an integer number (1020446430).

Almost surely, 2^21109291112 is an apocalyptic number.

It is an amenable number.

21109291112 is an abundant number, since it is smaller than the sum of its proper divisors (27872137528).

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

21109291112 is a wasteful number, since it uses less digits than its factorization.

21109291112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230522 (or 2230505 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 21109291112 in words is "twenty-one billion, one hundred nine million, two hundred ninety-one thousand, one hundred twelve".