21111099992 has 16 divisors (see below), whose sum is σ = 39975228000. Its totient is φ = 10451039200.

The previous prime is 21111099991. The next prime is 21111100001. The reversal of 21111099992 is 29999011112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111099991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13062992 + ... + 13064607.

It is an arithmetic number, because the mean of its divisors is an integer number (2498451750).

Almost surely, 2^21111099992 is an apocalyptic number.

It is an amenable number.

21111099992 is a deficient number, since it is larger than the sum of its proper divisors (18864128008).

21111099992 is a wasteful number, since it uses less digits than its factorization.

21111099992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26127706 (or 26127702 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 21111099992 in words is "twenty-one billion, one hundred eleven million, ninety-nine thousand, nine hundred ninety-two".