21486248 has 16 divisors (see below), whose sum is σ = 46042080. Its totient is φ = 9208368.

The previous prime is 21486239. The next prime is 21486251. The reversal of 21486248 is 84268412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191786 + ... + 191897.

It is an arithmetic number, because the mean of its divisors is an integer number (2877630).

Almost surely, 2^21486248 is an apocalyptic number.

21486248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21486248 is an abundant number, since it is smaller than the sum of its proper divisors (24555832).

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

21486248 is a wasteful number, since it uses less digits than its factorization.

21486248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 383696 (or 383692 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 21486248 is about 4635.3260942462. The cubic root of 21486248 is about 278.0055896604.

The spelling of 21486248 in words is "twenty-one million, four hundred eighty-six thousand, two hundred forty-eight".