21211011112 has 16 divisors (see below), whose sum is σ = 42110095860. Its totient is φ = 9981652224.

The previous prime is 21211011091. The next prime is 21211011131. The reversal of 21211011112 is 21111011212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18050997316 + 3160013796 = 134354^2 + 56214^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21211011092 and 21211011101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77981523 + ... + 77981794.

Almost surely, 2^21211011112 is an apocalyptic number.

It is an amenable number.

21211011112 is a deficient number, since it is larger than the sum of its proper divisors (20899084748).

21211011112 is a wasteful number, since it uses less digits than its factorization.

21211011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155963340 (or 155963336 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21211011112 its reverse (21111011212), we get a palindrome (42322022324).

The spelling of 21211011112 in words is "twenty-one billion, two hundred eleven million, eleven thousand, one hundred twelve".