21967248 has 20 divisors (see below), whose sum is σ = 56748848. Its totient is φ = 7322400.

The previous prime is 21967243. The next prime is 21967261. The reversal of 21967248 is 84276912.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21967241) 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, 228778 + ... + 228873.

Almost surely, 2^21967248 is an apocalyptic number.

It is an amenable number.

21967248 is an abundant number, since it is smaller than the sum of its proper divisors (34781600).

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

21967248 is a wasteful number, since it uses less digits than its factorization.

21967248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457662 (or 457656 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 21967248 is about 4686.9230844980. The cubic root of 21967248 is about 280.0648149273.

The spelling of 21967248 in words is "twenty-one million, nine hundred sixty-seven thousand, two hundred forty-eight".