21148486 has 8 divisors (see below), whose sum is σ = 32169744. Its totient is φ = 10425240.

The previous prime is 21148481. The next prime is 21148499. The reversal of 21148486 is 68484112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148481) 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, 74325 + ... + 74608.

It is an arithmetic number, because the mean of its divisors is an integer number (4021218).

Almost surely, 2^21148486 is an apocalyptic number.

21148486 is a deficient number, since it is larger than the sum of its proper divisors (11021258).

21148486 is a wasteful number, since it uses less digits than its factorization.

21148486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149006.

The product of its digits is 12288, while the sum is 34.

The square root of 21148486 is about 4598.7483079638. The cubic root of 21148486 is about 276.5411475594.

The spelling of 21148486 in words is "twenty-one million, one hundred forty-eight thousand, four hundred eighty-six".