22103561 has 2 divisors, whose sum is σ = 22103562. Its totient is φ = 22103560.

The previous prime is 22103513. The next prime is 22103563. The reversal of 22103561 is 16530122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19971961 + 2131600 = 4469^2 + 1460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22103561 is a prime.

Together with 22103563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22103563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11051780 + 11051781.

It is an arithmetic number, because the mean of its divisors is an integer number (11051781).

Almost surely, 2^22103561 is an apocalyptic number.

It is an amenable number.

22103561 is a deficient number, since it is larger than the sum of its proper divisors (1).

22103561 is an equidigital number, since it uses as much as digits as its factorization.

22103561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 22103561 is about 4701.4424382311. The cubic root of 22103561 is about 280.6429146653.

Adding to 22103561 its reverse (16530122), we get a palindrome (38633683).

The spelling of 22103561 in words is "twenty-two million, one hundred three thousand, five hundred sixty-one".