21972248 has 16 divisors (see below), whose sum is σ = 41813880. Its totient is φ = 10821888.

The previous prime is 21972241. The next prime is 21972257. The reversal of 21972248 is 84227912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21972241) 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, 19961 + ... + 21032.

Almost surely, 2^21972248 is an apocalyptic number.

It is an amenable number.

21972248 is a deficient number, since it is larger than the sum of its proper divisors (19841632).

21972248 is a wasteful number, since it uses less digits than its factorization.

21972248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41066 (or 41062 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 21972248 is about 4687.4564531311. The cubic root of 21972248 is about 280.0860619803.

The spelling of 21972248 in words is "twenty-one million, nine hundred seventy-two thousand, two hundred forty-eight".