21560941 has 2 divisors, whose sum is σ = 21560942. Its totient is φ = 21560940.

The previous prime is 21560939. The next prime is 21560969. The reversal of 21560941 is 14906512.

It is an a-pointer prime, because the next prime (21560969) can be obtained adding 21560941 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 2673225 = 4346^2 + 1635^2 .

It is a cyclic number.

It is not a de Polignac number, because 21560941 - 2¹ = 21560939 is a prime.

Together with 21560939, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1363195 and since 21560941 and 1363195 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21560911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10780470 + 10780471.

It is an arithmetic number, because the mean of its divisors is an integer number (10780471).

Almost surely, 2^21560941 is an apocalyptic number.

It is an amenable number.

21560941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21560941 is an equidigital number, since it uses as much as digits as its factorization.

21560941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21560941 is about 4643.3760347402. The cubic root of 21560941 is about 278.3273622330.

The spelling of 21560941 in words is "twenty-one million, five hundred sixty thousand, nine hundred forty-one".