21060773 has 8 divisors (see below), whose sum is σ = 22339800. Its totient is φ = 19786240.

The previous prime is 21060763. The next prime is 21060829. The reversal of 21060773 is 37706012.

It can be written as a sum of positive squares in 4 ways, for example, as 15382084 + 5678689 = 3922^2 + 2383^2 .

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 21060773 - 2¹⁰ = 21059749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060763) 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, 17243 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (2792475).

Almost surely, 2^21060773 is an apocalyptic number.

It is an amenable number.

21060773 is a deficient number, since it is larger than the sum of its proper divisors (1279027).

21060773 is a wasteful number, since it uses less digits than its factorization.

21060773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2247.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 21060773 is about 4589.2017824454. The cubic root of 21060773 is about 276.1583011577.

Adding to 21060773 its reverse (37706012), we get a palindrome (58766785).

The spelling of 21060773 in words is "twenty-one million, sixty thousand, seven hundred seventy-three".