21300473 has 8 divisors (see below), whose sum is σ = 22618440. Its totient is φ = 19989760.

The previous prime is 21300467. The next prime is 21300479. The reversal of 21300473 is 37400312.

It is an interprime number because it is at equal distance from previous prime (21300467) and next prime (21300479).

It can be written as a sum of positive squares in 4 ways, for example, as 5721664 + 15578809 = 2392^2 + 3947^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21300473 - 2¹⁶ = 21234937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21300479) 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 7 ways as a sum of consecutive naturals, for example, 5003 + ... + 8223.

It is an arithmetic number, because the mean of its divisors is an integer number (2827305).

Almost surely, 2^21300473 is an apocalyptic number.

It is an amenable number.

21300473 is a deficient number, since it is larger than the sum of its proper divisors (1317967).

21300473 is a wasteful number, since it uses less digits than its factorization.

21300473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 21300473 is about 4615.2435472031. The cubic root of 21300473 is about 277.2020360469.

Adding to 21300473 its reverse (37400312), we get a palindrome (58700785).

The spelling of 21300473 in words is "twenty-one million, three hundred thousand, four hundred seventy-three".