21384753 has 12 divisors (see below), whose sum is σ = 30875760. Its totient is φ = 13159536.

The previous prime is 21384749. The next prime is 21384763. The reversal of 21384753 is 35748312.

It is not a de Polignac number, because 21384753 - 2² = 21384749 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21384743) 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, 20583 + ... + 21596.

It is an arithmetic number, because the mean of its divisors is an integer number (2572980).

Almost surely, 2^21384753 is an apocalyptic number.

It is an amenable number.

21384753 is a deficient number, since it is larger than the sum of its proper divisors (9491007).

21384753 is a wasteful number, since it uses less digits than its factorization.

21384753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42208 (or 42195 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 21384753 is about 4624.3651456173. The cubic root of 21384753 is about 277.5671584878.

The spelling of 21384753 in words is "twenty-one million, three hundred eighty-four thousand, seven hundred fifty-three".