21486753 has 6 divisors (see below), whose sum is σ = 31036434. Its totient is φ = 14324496.

The previous prime is 21486737. The next prime is 21486779. The reversal of 21486753 is 35768412.

It can be written as a sum of positive squares in only one way, i.e., 21455424 + 31329 = 4632^2 + 177^2 .

It is not a de Polignac number, because 21486753 - 2⁴ = 21486737 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21486733) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1193700 + ... + 1193717.

It is an arithmetic number, because the mean of its divisors is an integer number (5172739).

Almost surely, 2^21486753 is an apocalyptic number.

It is an amenable number.

21486753 is a deficient number, since it is larger than the sum of its proper divisors (9549681).

21486753 is a wasteful number, since it uses less digits than its factorization.

21486753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2387423 (or 2387420 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21486753 is about 4635.3805669006. The cubic root of 21486753 is about 278.0077676694.

The spelling of 21486753 in words is "twenty-one million, four hundred eighty-six thousand, seven hundred fifty-three".