21710248 has 16 divisors (see below), whose sum is σ = 46522080. Its totient is φ = 9304368.

The previous prime is 21710239. The next prime is 21710251. The reversal of 21710248 is 84201712.

It is a happy number.

It is an unprimeable number.

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, 193786 + ... + 193897.

It is an arithmetic number, because the mean of its divisors is an integer number (2907630).

Almost surely, 2^21710248 is an apocalyptic number.

21710248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21710248 is an abundant number, since it is smaller than the sum of its proper divisors (24811832).

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

21710248 is a wasteful number, since it uses less digits than its factorization.

21710248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387696 (or 387692 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21710248 is about 4659.4257156864. The cubic root of 21710248 is about 278.9683464216.

The spelling of 21710248 in words is "twenty-one million, seven hundred ten thousand, two hundred forty-eight".