21111412 has 12 divisors (see below), whose sum is σ = 42222880. Its totient is φ = 9047736.

The previous prime is 21111397. The next prime is 21111457. The reversal of 21111412 is 21411112.

21111412 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21111392 and 21111401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376962 + ... + 377017.

Almost surely, 2^21111412 is an apocalyptic number.

It is an amenable number.

21111412 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21111412 is a wasteful number, since it uses less digits than its factorization.

21111412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753990 (or 753988 counting only the distinct ones).

The product of its digits is 16, while the sum is 13.

The square root of 21111412 is about 4594.7156604082. The cubic root of 21111412 is about 276.3794577607.

Adding to 21111412 its reverse (21411112), we get a palindrome (42522524).

The spelling of 21111412 in words is "twenty-one million, one hundred eleven thousand, four hundred twelve".