22108081 has 2 divisors, whose sum is σ = 22108082. Its totient is φ = 22108080.

The previous prime is 22108003. The next prime is 22108087. The reversal of 22108081 is 18080122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18835600 + 3272481 = 4340^2 + 1809^2 .

It is a cyclic number.

It is not a de Polignac number, because 22108081 - 2²¹ = 20010929 is a prime.

It is a super-2 number, since 2×22108081² = 977534491005122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22108087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11054040 + 11054041.

It is an arithmetic number, because the mean of its divisors is an integer number (11054041).

Almost surely, 2^22108081 is an apocalyptic number.

It is an amenable number.

22108081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22108081 is an equidigital number, since it uses as much as digits as its factorization.

22108081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 22108081 is about 4701.9231171936. The cubic root of 22108081 is about 280.6620430992.

The spelling of 22108081 in words is "twenty-two million, one hundred eight thousand, eighty-one".