21733037 has 2 divisors, whose sum is σ = 21733038. Its totient is φ = 21733036.

The previous prime is 21733027. The next prime is 21733043. The reversal of 21733037 is 73033712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21473956 + 259081 = 4634^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 21733037 - 2¹⁰ = 21732013 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21732997 and 21733015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21733027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10866518 + 10866519.

It is an arithmetic number, because the mean of its divisors is an integer number (10866519).

Almost surely, 2^21733037 is an apocalyptic number.

It is an amenable number.

21733037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21733037 is an equidigital number, since it uses as much as digits as its factorization.

21733037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 26.

The square root of 21733037 is about 4661.8705473233. The cubic root of 21733037 is about 279.0659222532.

Adding to 21733037 its reverse (73033712), we get a palindrome (94766749).

The spelling of 21733037 in words is "twenty-one million, seven hundred thirty-three thousand, thirty-seven".