21112672 has 24 divisors (see below), whose sum is σ = 47504016. Its totient is φ = 9048192.

The previous prime is 21112639. The next prime is 21112673. The reversal of 21112672 is 27621112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112673) 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, 46903 + ... + 47350.

It is an arithmetic number, because the mean of its divisors is an integer number (1979334).

Almost surely, 2^21112672 is an apocalyptic number.

It is an amenable number.

21112672 is an abundant number, since it is smaller than the sum of its proper divisors (26391344).

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

21112672 is an equidigital number, since it uses as much as digits as its factorization.

21112672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94270 (or 94262 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 21112672 is about 4594.8527723965. The cubic root of 21112672 is about 276.3849560695.

Adding to 21112672 its reverse (27621112), we get a palindrome (48733784).

The spelling of 21112672 in words is "twenty-one million, one hundred twelve thousand, six hundred seventy-two".