21038733 has 6 divisors (see below), whose sum is σ = 30389294. Its totient is φ = 14025816.

The previous prime is 21038729. The next prime is 21038777. The reversal of 21038733 is 33783012.

It can be written as a sum of positive squares in only one way, i.e., 20766249 + 272484 = 4557^2 + 522^2 .

It is not a de Polignac number, because 21038733 - 2² = 21038729 is a prime.

It is a super-3 number, since 3×21038733³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21038697 and 21038706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1168810 + ... + 1168827.

Almost surely, 2^21038733 is an apocalyptic number.

It is an amenable number.

21038733 is a deficient number, since it is larger than the sum of its proper divisors (9350561).

21038733 is a wasteful number, since it uses less digits than its factorization.

21038733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337643 (or 2337640 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 21038733 is about 4586.7998648295. The cubic root of 21038733 is about 276.0619347460.

The spelling of 21038733 in words is "twenty-one million, thirty-eight thousand, seven hundred thirty-three".