22010861 has 2 divisors, whose sum is σ = 22010862. Its totient is φ = 22010860.

The previous prime is 22010843. The next prime is 22010881. The reversal of 22010861 is 16801022.

It is an a-pointer prime, because the next prime (22010881) can be obtained adding 22010861 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21855625 + 155236 = 4675^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 22010861 - 2¹⁸ = 21748717 is a prime.

It is a super-3 number, since 3×22010861³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22010881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11005430 + 11005431.

It is an arithmetic number, because the mean of its divisors is an integer number (11005431).

Almost surely, 2^22010861 is an apocalyptic number.

It is an amenable number.

22010861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22010861 is an equidigital number, since it uses as much as digits as its factorization.

22010861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 22010861 is about 4691.5734034543. The cubic root of 22010861 is about 280.2500360087.

Adding to 22010861 its reverse (16801022), we get a palindrome (38811883).

The spelling of 22010861 in words is "twenty-two million, ten thousand, eight hundred sixty-one".