21011112 has 48 divisors (see below), whose sum is σ = 59904000. Its totient is φ = 6634656.

The previous prime is 21011083. The next prime is 21011141. The reversal of 21011112 is 21111012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21011083) and next prime (21011141).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21011094 and 21011103.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6312 + ... + 9047.

It is an arithmetic number, because the mean of its divisors is an integer number (1248000).

Almost surely, 2^21011112 is an apocalyptic number.

It is an amenable number.

21011112 is an abundant number, since it is smaller than the sum of its proper divisors (38892888).

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

21011112 is a wasteful number, since it uses less digits than its factorization.

21011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15390 (or 15383 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 21011112 is about 4583.7879532108. The cubic root of 21011112 is about 275.9410712249.

Adding to 21011112 its reverse (21111012), we get a palindrome (42122124).

The spelling of 21011112 in words is "twenty-one million, eleven thousand, one hundred twelve".