21112109996 has 24 divisors (see below), whose sum is σ = 38959158000. Its totient is φ = 9982877184.

The previous prime is 21112109989. The next prime is 21112109999. The reversal of 21112109996 is 69990121112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21112109999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200861 + ... + 287348.

It is an arithmetic number, because the mean of its divisors is an integer number (1623298250).

Almost surely, 2^21112109996 is an apocalyptic number.

It is an amenable number.

21112109996 is a deficient number, since it is larger than the sum of its proper divisors (17847048004).

21112109996 is a wasteful number, since it uses less digits than its factorization.

21112109996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488801 (or 488799 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 41.

The spelling of 21112109996 in words is "twenty-one billion, one hundred twelve million, one hundred nine thousand, nine hundred ninety-six".