21927712 has 24 divisors (see below), whose sum is σ = 44660700. Its totient is φ = 10585344.

The previous prime is 21927673. The next prime is 21927713. The reversal of 21927712 is 21772912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19749136 + 2178576 = 4444^2 + 1476^2 .

It is not an unprimeable number, because it can be changed into a prime (21927713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10887 + ... + 12742.

Almost surely, 2^21927712 is an apocalyptic number.

It is an amenable number.

21927712 is an abundant number, since it is smaller than the sum of its proper divisors (22732988).

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

21927712 is a wasteful number, since it uses less digits than its factorization.

21927712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23668 (or 23660 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 21927712 is about 4682.7034926418. The cubic root of 21927712 is about 279.8966965857.

The spelling of 21927712 in words is "twenty-one million, nine hundred twenty-seven thousand, seven hundred twelve".