21199248 has 60 divisors (see below), whose sum is σ = 67807168. Its totient is φ = 6056640.

The previous prime is 21199229. The next prime is 21199249. The reversal of 21199248 is 84299112.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is not an unprimeable number, because it can be changed into a prime (21199249) 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 11 ways as a sum of consecutive naturals, for example, 9508 + ... + 11523.

Almost surely, 2^21199248 is an apocalyptic number.

21199248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21199248 is an abundant number, since it is smaller than the sum of its proper divisors (46607920).

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

21199248 is a wasteful number, since it uses less digits than its factorization.

21199248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21052 (or 21043 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 21199248 is about 4604.2641105827. The cubic root of 21199248 is about 276.7622282428.

The spelling of 21199248 in words is "twenty-one million, one hundred ninety-nine thousand, two hundred forty-eight".