22009973 has 2 divisors, whose sum is σ = 22009974. Its totient is φ = 22009972.

The previous prime is 22009963. The next prime is 22009991. The reversal of 22009973 is 37990022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13675204 + 8334769 = 3698^2 + 2887^2 .

It is a cyclic number.

It is not a de Polignac number, because 22009973 - 2⁴ = 22009957 is a prime.

It is a super-2 number, since 2×22009973² = 968877822921458, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22009943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11004986 + 11004987.

It is an arithmetic number, because the mean of its divisors is an integer number (11004987).

Almost surely, 2^22009973 is an apocalyptic number.

It is an amenable number.

22009973 is a deficient number, since it is larger than the sum of its proper divisors (1).

22009973 is an equidigital number, since it uses as much as digits as its factorization.

22009973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 22009973 is about 4691.4787647393. The cubic root of 22009973 is about 280.2462671817.

Adding to 22009973 its reverse (37990022), we get a palindrome (59999995).

The spelling of 22009973 in words is "twenty-two million, nine thousand, nine hundred seventy-three".