21204111112 has 32 divisors (see below), whose sum is σ = 41859597600. Its totient is φ = 10041801984.

The previous prime is 21204111091. The next prime is 21204111121. The reversal of 21204111112 is 21111140212.

It is a super-2 number, since 2×21204111112² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 806803 + ... + 832669.

It is an arithmetic number, because the mean of its divisors is an integer number (1308112425).

Almost surely, 2^21204111112 is an apocalyptic number.

It is an amenable number.

21204111112 is a deficient number, since it is larger than the sum of its proper divisors (20655486488).

21204111112 is a wasteful number, since it uses less digits than its factorization.

21204111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31285 (or 31281 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21204111112 its reverse (21111140212), we get a palindrome (42315251324).

The spelling of 21204111112 in words is "twenty-one billion, two hundred four million, one hundred eleven thousand, one hundred twelve".